To be perfectly honest I do not think Nick beats anyone in the Top 10 at MW. He just gives up way way too much size.
When it comes to Belfort he would be in real trouble. He likes taking too many shots to give shots and allowing Belfort to hit you is in the first chapter of "How to lose a fight in the First Round VIA KO 101." So Belfort puts Diaz away in the first round in rather violent fashion.
Greatest of All Time