Only fighters I can think of to jump two weight classes between fights are Conor McGregor 145 -> 170 and Ildemar Alcantara who went from 205 -> 170 has been bouncing around welterweight, middleweight and LHW for a few years now having his last fight at 205. Anyone else jump two weight classes between fights?
Rumble WW - HW Vitor, Moose, Wand, Joey Beltran MW -HW Diego, Kenflo FW-MW BJ Penn FW-HW (ow against machida, but more LHW as he weighted 191 lbs)