This whole notion of homegrown talent is the biggest bag of bullshit ever. I'm sorry to say but it is. During the territories and Monday Night Wars, guys would move around all the time. If they didn't, Steve Austin, Triple H, Undertaker, Chris Jericho, Big Show, etc... never would have come to the WWE. WCW never would have exploded with top WWF guys or had the nWo angle that toppled the WWF in the ratings war for 84 weeks.
Jump forward to today and no one calls out WWE for having CM Punk and Daniel Bryan as the World Champions. Both guys are ROH born and breed talent.
Talent are allowed to move between promotions. You don't sign up one place and get labeled a "WWE" or "TNA" guy their whole career. Fuck that.