Mendes is a trained MMA fighter that was forced to stand with Conor before he took him down.
Pro wrestlers would need time to train to stand a chance against Conor. Even if Kurt Angle took Conor down, then what? Anyone can clasp their hands together and hold someone down, but if it's MMA then you have to be active or you get stood up. What would he do? Does he know how to retain guard, half guard, side control, or mount? Can he posture up and throw punches? Can he prevent Conor from slipping away and getting back up to his feet while trying to be active on top?
This isn't a black and white issue of "guy can wrestle so he will take down striker and win." People have come into MMA with incredible wrestling credentials, actually trained MMA and still done horrifically bad. Not only this, but your body needs to get accustomed to fighting. They would gas, quickly. Wrestling shape is totally different from being conditioned to fight.
Kurt Angle would get fucked up, and I don't like Conor an iota