Jimi Manuwa has a style that fits the kickboxing ring very well at LHW, but Gustafsson was a boxing champ, so he'll probably know to handle himself in that environment too.
At FW, Aldo, without any shadow of a doubt. Maybe Hominick too back in the day.
LW is a toss up between Pettis and Barboza (and maybe Njokuani), after all, Barboza did lots of pro MT himself and Njokuani did some too. When Cerrone was at a better shape, he was not too shabby either and comes from a MT background too.
WW is loaded with great strikers like Alves, Condit, Thatch, Saffiedine, Brown and probably some names I forgot.
At MW I still think prime Anderson is a one in a generation striker.
HW - probably JDS, Hunt and maybe Overeem with big gloves and lots of horse meat.
"His kicks are so powerful due to his soccer background" = "I know nothing else about Brazilians"