By “clan” I kind of mean more than one, sort of like the Mitzukami Clan (Kairi, Hokuto, Nanase) or Ibuki’s clan. Their can only be one master of Bushinryu at any given time.
I have no idea when Maki’s father trained Zeku but it could of quite possible happened before either Guy or Maki were born.
Back during Final Fight 2, none of this “succesor” stuff mattered. Maki’s father was Guy’s master. Maki had recieved some training from him too(at this point in time you can argue it was more of a clan.)
SFZ2 changed all of that. In SFZ2 it was stated that their could only be one master at a time and it was retconned making Zeku Guy’s master. Capcom apparently forgot about Maki’s father and said Maki’s father was now officially Zeku’s master. Guy defeats Zeku and Guy is the one who inherits the style.
Wiether or not Guy killed Zeku is another argument all together. There is however zero evidence if Zeku survived, and the wording made it seem like it was a death match. How/why Zeku did not kill Maki’s father (if it was indeed a death match) seems like it’s the current loophole/unexplained event.
Maki apparently will be the next to inherit the style. In CVS2 (unofficial game) Guy is missing. In SFZ3 on the Gameboy she is looking for Guy(but is she really supposed to be there or is that an Easter Egg… and, wouldn’t she of found Guy since he apparently goes back to Metro City for Final Fight 3?) Anyway, looks they are supposed to have a match at some point and/or a death match but they prolly won’t show it ever.
So basically right now Bushinryu is -
Genryusai, Maki’s father - Defeated. No longer practices the art. There’s the off chance he died of old age sometime after FF2, no official statement. Guy is dating his other daughter Rena.
Zeku - Defeated and/or dead. Either way, no longer practices the art.
Guy - The Bushinryu master
Maki - A pupil of her father, perhaps looking for Guy to train her and/or a match?
So the style is really now Master/Pupil even though the Master hasn’t actually trained the pupil as far as we know.
Probably the best comparison is Fist of the North Star. Their can only be one inheritor of the Fist of the North Star (Hokuto No Ken) at any given time. All other disciples that are not chosen to be the inheritor are either -
A. Killed by the Master and/or Inheritor - Raoh, Jagi
B. Must willingly give up the style - Toki who used the style to heal the sick
C. Have their fists crush so they can no longer use the style
D. Have their ‘memory’ pressure points pressed so that they forget that they learned the style in the first place.
BTW, Sho of Captain Commando is also a Bushinryu master apparently was a student of Guy. So that would make Sho the successor. But Captain Commando was made before SFZ2 and before Capcom altered what Bushinryu was, so who knows if Captain Commando really exists in the SF Canon. In Namco x Capcom both Guy and Sho are working together, but in Namco x Capcom the World’s have “merged” and that’s the game’s plot. Guy is from our current world, the “Physical World.” Sho is from the “Far Future World.” Due to the worlds merging in NXC that’s how they are able to come together. The other worlds in the game are “The Makai,” (AKA the Underworld) “The Fantasy World,” “The Spirit World” and the “God World.”