You had to be invited to the Super 6, the European names that took part were well known.
You want Golovkin to move up, well he has offered to at least 5 times, all the fights were turned down.
He has offered to move down too, to fight your guy and again was rebuffed.
However, the original premise that you have to beat a PFP opponent to be on the PFP list is a nonsense. In a lot of cases it's just not possible.
Who did he offer to move up to 168? he said he'd move up to 168 to fight Chavez, who's a bum or Froch, who retired, who else got offered a fight with GGG at 168 who's a legit challenger, GGG should've started campaigning at 168 long time ago and a fight between him and Ward would've already been made, but it's all good though, cleaning up a division is not a bad idea but I still believe that if anyone wants to be in the top 5 P4P u have to have beaten someone on the P4P list, even top 15 P4P. P4P fighters are well distributed over the weight classes, people consider Klitschko, Kovalev, Ward, GGG, Lara (personal opinion), Floyd Mayweather, Manny Pacquiao, Lomachenko, Rigo and Gonzalez to be the top P4P guys, it's not hard for any of them to move up or down to fight the other to be top 5 P4P, Ward can move up to fight Kovalev and GGG can move up to fight Ward or Lara can move up to fight GGG or Floyd can move up to fight GGG (although not realistic) and and Lomachenko can move up to become a champ at the weak 130 lbs division and maybe meet Walters there, Rigo can move up and fight Lomachenko or move down to fight Gonzalez at 118, these are all possibilities, it's not impossible, Floyd moved to 154 to fight Cotto at the age of 35 and despite him not even making 151 he still won, and again he moved up for Canelo at 36 and still won, he did these things while he has absolutely no business fighting at 154 since he never made the weight, I think GGG can comfortably make 168 and Ward can comfortably make 175 also Lomachenko can easily make 130.
GGG should've campaigned at 168 for a while then fought Ward then the winner should move up to fight Kovalev, that's what makes the most sense and the winner of this "tournament" should become the #1 P4P fighter in the world.