In my opinion best p4p list is this. Very logical. I think Estrada should be a bit higher maybe. I put a lot of thought into it.
Canelo should be #1. Tough to make the list. Arguably all of them has the claim to be ranked high. Inoue is the most dominant fighter in 3 weight classes. Beterbiyev has been cleaning his weight class with ease. Usyk cleared whole cruiserweight. Loma was 3 weight class champion. Lopez beat him, so he should be in the contention as well, but his resume is still a bit thin. Pacquiao is in the discussion because of Thurman win. If you are putting Canelo in there that high, you should also put Golovkin in there, but again, he has not fought in a while. How about Charlos? Tough. I feel Pacquiao should not be in the list p4p. Multiple weight champions, dominant, so should be Canelo, Inoue, Crawford, Loma. Then you can make argument for single weight class dominant fighters. Why Usyk over Fury? Usyk answered every question at Cruiserweight, Fury still needs to answer the question of AJ. Why Golovkin is so high? Arguably, he beat Canelo 1 or 2 times, depending on your angle, and if Canelo is there, Golovkin should be in the discussion. Why Loma higher than Lopez? Well, as I said multiple weight champion, same as Inoue, Canelo, Crawford. Why Lopez so low? Single weight class. Why Jermell is so high? He is the number 1 in his weight class, no unanswered questions. Estrada is up there too, pretty dominant. He needs to rematch Gonzalez though, although he beats the guy who beat him. Beterbiyev still has Dmitry Bivol to deal with. Why Beterbiev over Bivol? Because of Gvozdyk win.