Except that almost everything you learn in wrestling puts you in a position to be beaten by someone who knows Jiu Jitsu. Everything gets switched around and the stuff that works in wrestling just makes things easier for an opponent using Jiu Jitsu. That's simple fact coming from a guy trained in both. It's not the same thing as pitting a boxer against a Karate fighter. In that scenario, both opponents try to hit each other, and both can work equally well because one style isn't meant to capitalize on all the strengths of the other and turn them into weaknesses. That's how it is with Jiu Jitsu and wrestling. Everything good in wrestling becomes bad in Jiu Jitsu. Or most of it at least.

But yeah. Philosophical debate, more or less.

Posthumous edit: You're right, Gracie's didn't start MMA, I meant to say they started what would become the UFC.