Guys like BJ, Randy, Hendo, Vitor and Anderson are first class fighters who want to test themselves. Maybe add Frankie since he's fought in a weightclass with bigger guys his whole life.
Guys like GSP are great and all but I'll never mention them in the same sentence as the other guys except when I wanna say "He's not as great as one of them".
Rookie Hammer Squad 2015
Frankie Edgar - Dominick Cruz - Jorge Masvidal - Cat Zingano - Holly Holm