I really wonder what's the deal with Luffy not using G4 with advCoA/advCoC applications.
The only thing that would make sense is that it would be too hard for him to constantly use G4 + advCoA/advCoC.
Tho Oda has not fucking continuity with his writing since Luffy was literally spamming advCoC recently with no rest wheras he was gassed out after one round with advCoA.