The plot guide is currently not at gamefaqs thanks to a server move that apparently accidentally deleted the miscellaneous coin op genre section, which is where the plot guide was located (and was an absolutely HORRIBLE place for them to put it, I must say). It’s still at Fighter Mania (http://kattuggla.oru.se/dmd01/dm0103/test/), though, updated enough to answer most of the questions but that would take some searching so I’ll just answer them here.
Ah well. Hopefully the situation will be rectified. I’ll just load up the ol’ text file and try to answer as many of those questions as I can.
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Sodom’s fighting style is listed in his official bio as “Self taught Martial Arts”. Which would explain why it doesn’t have a name.
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The katanas in Final Fight when you pick them up during the fight with Sodom are labelled as “Masamune” (you can see the name of the item you pick up under your name whenever you pick something up). Both of them have that name (I knocked both out of Sodom’s hands then picked both up). As for whether or not he has the sais, I’m inclined to think that he actually switched over to them by canon and that X-Ism is a tribute to how he used to use katanas in Final Fight (sorta like how X-Ism Rolento is a tribute to how Rolento would hop all over the place in Final Fight). I’m not sure, though. Maybe Saiki could answer that better or something 
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Well, assuming/speculating that their fate was shown in-game in any way, there are only two endings that deal with them in SFA3. One is where Sodom kamikazes and dissappears and Rolento thinks he is still alive, and another is when they make up and decide to once again go out there for Mad Gear’s ideals together. Now, the former really can’t (or probably can’t) happen because we all know that the real way that Shadaloo blew up was via Charlie and Guile, so that leaves us with only the latter of the two making up. And I personally feel it’d be really dumb to have an ending of them making up (which is a significant character development thing) and then have that ending just be what-if, but I suppose you never know. Anyways, although Sodom is a Japophile, in the end, he still sticks to America the most, I believe. The main reason he went east in between SFA2 and SFA3 wasn’t to spend time in Japan but to recruit Japanese warriors to his cause. His stage in SFA3 is in America, isn’t it? Ah, I’ll go check after this post. Well, anyways, I imagine he and Rolento are both the leaders of whatever new organization they started up or tried to start up (though I wouldn’t be surprised if they kept it with the Mad Gear name, but it was never really stated).
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SFA3: 1990
SF2 and death of Bison: 1993
Rival Schools: IF it takes place in the same continuity as Street Fighter, then it had to be 1989. Sakura’s a second year student and 15 years old and has already met Ryu, which would all be one year past SFA2. Of course, the Rival Schools Evolution disk 1 has things like a wonderswan and fast internet and a whole bunch of other stuff that was out in 1999, but it also has an arcade with various Street Fighter games of all things. …and Sakura isn’t in Evolution 1 at all. In Evolution 2, she’s there, but Evolution 2 doesn’t have things like fast internet and cell phones and wonderswans and arcades with Street Fighter in them to my knowledge.
Project Justice: One year after Rival Schools. Which IF it takes place within Street Fighter continuity would be 1990.
Maki went after Guy after Guy went missing. Guy went missing sometime after SFA3/FF3. Well, he’s obviously not missing in Final Fight 3 since he’s playable there, but FF3 almost positively happened after SFA3. However, in SFA3 Advance, Maki is searching for the missing Guy, then. …course, SFA3 Advance has absolutely no storyline dialogue whatsoever or any indication of whether the new stories there are canon/took place during that time or not. Yun’s storyline of course is all out of timeline whack. 
Mad Gear was destroyed with the official date given being 1989. Which would be one year after Street Fighter Alpha 2 and Final Fight 2. Or probably more accurately, FF2 was what brought it down.
Street Fighter 3: 1998 for Double Impact (which replaces New Generation, though they’re the exact same thing anyways right down to each line of dialogue and ending). For Third Strike, no specific date was given, but it happens nearly right after Double Impact so you know that it’s either 1998 or 1999.
- I’m can’t specifically figure out if their birthday for thes year happened or not since the specific month of SF3 was never given, so I’ll only compare the year of their birth to the SF3 year of 1998.
Balrog: 29
Vega: 31
Chun-Li: 30
Guile: 38
Amy: Amy was no older than 12 in SFII so she would be 17~18 in SFIII 3rd Strike time period.
Mel: 5 years old (conceived and born shortly after Eliza and Ken were married)
Ken: 33
Ryu: 34
Sean: No birthdate given. I think he’s about 16 during SF3 but I never was able to get an official confirmation. …SF3 had a lot of teenagers, though.
Sakura: 24
Batsu: 24? Same age as Sakura, I think.
Kyosuke: 24? Same age as Batsu, right?
Guy: 33 or 35. Problem here is that Guy is stated to be 24 during Final Fight, which is supposed to have taken place in 1987, but Capcom sometimes mistates Final Fight to have taken place in 1989, too, making Guy’s age around Third Strike to be possibly either 33 or 35.
Kurow Kirishima: 23? First year in PJ.
Yurika: Erm… 24? Sigh, I’m mixing up which years each of the students were in during Rival Schools again. Blarg. Kurow is her younger brother, though, so she’s older than him.
Dan: He’s older than Ryu and Ken, and Sakura calls him “Oji-san”, so he’s probably around 27 to 35 in the SFA series, making him 35 to 43 in the SF3 series.
Whew, hope I was of help!
[EDIT]
…OOOOOOKAY, I just found out that at the end of Evolution 2, Hinata hears that Sakura joined up with Ruby Heart for a team battle. So much for taking THOSE seriously. :eek:
[EDIT 2]
Okay, I went to check out the source. It seems that snowstorm says that Hinata makes the comment about Sakura and Ruby Heart in the 2nd Year School Festival, which would be Project Justice’s board game. But I see no mention whatsoever of Sakura or Ruby Heart in that translation file and find it extremely hard to believe in general. Bah, can’t that lousy 'flake be good for anything?