We should push for TJ vs Max. That is a p4p fight. Even GSP said "I don't call out fighters from smaller division. It is like bullying." I agree.
P4P is a smaller fighter who moves up to a higher weight class (a reasonable move up), and if he also succeeds in that division, then we can say "You know what, if Fighter A was 265 lbs, he would be a HW champion. Why? because he started at 125 and he won. He moved up to 135 and he won. He moved up to 145, and he won. So, if there was a USADA friendly way for Fighter A to move up to 155 and 170, he would probably continue winning. So, P4P, he is the best fighter."
This is what P4P means. It is an hypothesis of what a smaller fighter could have achieved, if it was possible for him to fight at way bigger classes, based on the success he had in higher weight classes that were reasonable for his frame.
Going down a weight class doesn't make you a p4p fighter. I like TJ Killashaw, but I am not going to move my goal post, just because he is one of my favorite fighters to watch. He ain't right with this one. He wants to attach himself to DJ's name, instead of taking the bigger challenge of creating his own legacy by stepping up to Max Holloway.
Just my opinion