Well, yea. I can accept the possibility of that.. but then I could accept such a possibility for numerous other studio/publisher combos that make games along the lines of Street Fighter without issue. You're stating it as a fact however, which is completely different. Hedging your bets with an offer that cushions development costs isn't the same as not being able or willing to develop the game otherwise. Sega will happily take up an offer from Nintendo for Sonic games... but in the absence of that offer, they'd likely make... Sonic games.
So if you're going to state that SFV would not have happened without being turned into an exclusive, I want you to provide evidence of that. If there isn't any, then simply stop stating it like a fact.