This is only partially true. Team sports where your an employee and have a union ? (aka not the UFC) Yes.
Independant contractor where you paid commission ? (aka UFC) Then No. ATP tennis pays less than 20% and has a higher talent pool. PGA some years is under 30% and that number is about to go down once they re-structure the TV deal that's about to expire
In this context (entry level fighter on 1st contract) yes. D-league and practice squad in 90% of sports has a higher talent pool and more previous exposure than most UFC fighters......
Also medicore was in response to payout and not talent, 90% of these d-league players have 10x the talent as a generic prelim ufc fighter