Loki killed a HK. I don't believe it was cause of aCoC.
Gaban and the Roger pirates have also failed to ever finish off the HK, hence why Super Sommers is still around 40 years later.
Sanji basically accomplished vs Killingham what Gaban did vs Super Sommers earlier and he didn't even need to use aCoC.
If Sanji gets PoL, but Luffy and Zoro don't, would that not make things equal?