PoL
CoC is nearly a lock to me but PoL is a question mark currently
Though it’s starting to be more of a 50/50 thing for me specifically because of the Queen fight
I reread it recently and if I’m being honest the PoL powerup might actually come first
The Queen fight was all about Sanji’s history with Germa and rejecting the possibility of becoming a Warrior of Science. In that fight he obtained the exoskeleton which allowed him to create Ifrit Jambe
The Sommers fight will likely have a lot to do with Sanji’s ideology regarding love and women. In this fight it wouldn’t be a reach to say he’ll obtain a power that coincides with the theme of the fight. That being love
I don’t regard PoL as an ability that has to or necessarily can be unlocked.
As presented, it appears to be more like an inherent trait to those characters Oda defined by their capacity for love.
Those characters, if prolific fighters, tend to be Conquerors. If Sanji’s Lady Radar and Garp’s CoC and flames attack on GV are any indication, it appears PoL is highly compatible with Haki. Who’s to say Sanji wasn’t using Armament and PoL in his laser feat?
I would not be surprised if Gaban can coat his axes in flames.
As for what will happen with Sanji, I believe he will awaken Conqueror’s Haki and instinctively use it to defeat Sommers.
I still suspect Gaban or someone else will make an interesting comment on love that may inform more of our understanding.
Thriller Bark and Parage Shot could also be interpreted indications of Sanji rebelling against DR and/or liberating others with new PoL flames.