I think we should have the hero side and the villain side power rankings done before we get real matchups. Even though it seems that the current expected matchups are set, we must not forget that Oda takes a very twisted route to set up final matches. So before people change their stances based on who their fav is going to fight let us decide on power levels on each side.
Villains:
1. Imunko (pretty straight forward)
2. Killingham (with nightmare army)
3. DR Dorry/Broggy (individually they are stronger than Killingham but he has army, DR and HK both have undying bodies so in terms of pure power the giants are above the HKS imo)
4. Sommers (guy has got nothing but Ls so far but he is till a HK and should be YC level character on his own without the pact buff)
5. Killingham (no army, I think Sommers is individually stronger, at least guy has more xp since he was at GV while Killingham looks younger and wasnt shown in GV)
Heroes:
1. Loki/Luffy/Zoro
2. Gaban
3. Sanji
4. Jinbe
5. Hajrudin