Okay so here we are. I was speaking with a friend today who basically blew my mind. I have never paid much attention to frame data but the way I read it was that if something was +5 on hit, and the follow up was 3f then that means you have 2 frames to get it out… 5-3 = 2 heh. well I am apparently wrong, but I wish to check from other more advanced Adon players.
edit: I am not saying my friend is wrong, but maybe im the only one wrong…
Help?
You must add one frame because like you know we can combo with a crouch lk after the close hp or the overhead which are at +4 on hit and the crouch lk has a strat-up of 4 frames, you don’t have 0 frame to get it out of course.
These are just frame links you have one frame to confirm, that means 3 crouch lp is 3 frames combo not 2, I don’t know why it’s +5 and not +6 on hit on the frame data.
Okay thanks for clearing that up for me 
This was posted to me. I don’t specifically know Adon’s frame data, but I’m fairly sure Balrog’s EX loop has a 2 frame window (I can pull this off most of the time). Also, many of Vega’s links are 1 frames and I have no chance of pulling them off. However, I can do Adon’s BnB fine in training mode (as all of you guys can), so to me this does not make sense.
I don’t know Adon’s frame data, nor do I play him. But, in SF4, the timing in which you have to link the second cr. lp depends on the recovery timing of cr. lp on hit.
If that sounds unclear, here is an example.
For Example:
Ryu’s forward hp to cr. hp
A specific timing based on the ending of solar plexus. Rather fast to hit, and if you are doing it by sight, you can hit the link by plinking the Hp with lp +mp right past when Ryu’s arm retracts and crosses his knee.
Evil Ryu’s m. Axe kick to cr. mp
A specific timing based on the ending of M. Axe Kick. Similar to the above link, but with a fraction more wait time. If you can hit the above link without plinking, and you try the same timing here, It will not work, because while they are both 1 frame links, each move ends at a different time allotting for your 1 frame to come at different timings.
The reason the startup numbers are what they are used to be explained, but it doesn’t seem to be on the wiki right now, so I’ll write it out. Even though it says “startup 3”, what that 3 actually means is that the first active frame is on frame 3. This is why stuff like Gief’s Ultra, which is refered to as “zero frame throw” has a startup of 1 listed, because even though it has 0 startup frames, it is first active on frame 1.
The reason it does this I believe, is that it makes it easier to make simple “does this link/punish” comparisons. Eg, a +5 move means you can link a 5 frame move after it, a -5 move can be punished with a 5 frame move, and anything extra is how much leniency you have, so linking a 3 frame move after a +5 move works, and has 2 extra frames of leniency, which means a 3 frame link.
Thanks very much for the explaination robotic elf. That was really helpful and I am glad a few of you helped clear this up for me. I dont know if this is a good or bad thing for me, guess it doesnt change the way I play (dont tend to drop links offline anyway) but may help me with deciding on combos and frametraps in the future 
thanks again
Cr lp to cr lp for Adon is not a 1 frame link. His cr lp has a 3 frame startup and it gives +5 frame advantage so its a 3 frame link.
I think that person was referring to Vega whose cr lp has a 4 frame startup and it gives + 4 frame advantage.
Actually that person really was referring to Adon, without doubt. But thank you for the verification.