I looked into their talent loss before I joined GAF. From what I saw, the only individual to be director, producer, executive producer, or game planner on debut game for any Capcom series to produce a million seller is Masahiro Yasuma (Mega Man Battle Network). No idea what he's doing now. No idea who worked on Final Fight, either, so maybe those people are still at the company.
The most major losses may be Yoshiki Okamoto (Street Fighter II), Noritaka Funamizu (Monster Hunter, Marvel vs Capcom), Tokuro Fujiwara (Ghosts 'n' Goblins, Commando), and Keiji Inafune (Dead Rising, Lost Planet, Onimusha). Each is credited on at least fifty games at Capcom.
But I don't know how much weight these big names actually have. They haven't had explosive successes after leaving the company. I also didn't look much into the guys who headed the sequels; there's no reason why those guys can't become big names themselves.
Here's some links regarding Capcom's corporate environment that may be interesting:
http://www.eurogamer.net/articles/2012-06-11-the-rise-and-collapse-of-yoshinori-ono
http://www.gamesindustry.biz/articles/2012-06-11-yoshinori-ono-street-fighter-4-was-an-unwanted-child
http://andriasang.com/comvgl/inafune_capcom_dev_secrets/