Great finish and I think Max beats him even at lightweight, but the weight cut was the biggest contribution to the finish. Pettis is one of, if not the toughest fighters in the game, but his body gave out. 3 rounds of Barboza kicks. 5 rounds of a beatdown by RDA with a broken orbital in the first.
https://www.reddit.com/r/MMA/comments/92eda3/max_holloway_stops_anthony_pettis_ufc_206/