I think this depends a lot on the manner in which he wins. If he is being outclassed throughout the fight and then lands a lucky punch that KOs PBF, then I don't see him moving up much.

Now if he is competitive throughout and finishis strong to take the victory at the end, then he will most likely be catapulted to the top five.

No matter the outcome, he should not be number 1. I would put PACMAN #1 followed by Wright, JT, BHOP, JMM and probably have Oscar around 5ft or 6st and PBF right under him. Can't drop PBF too much considering the circumstances of this fight.