
While oda could technically just have zoro and sanji go the same route as luffy when it comes to strengthening his haki with powers like internal destruction or future sight i personally doubt he will


Luffy just developing it in a more linear fashion getting the most advanced form of armament with internal after unlocking external

Zoro through having external armament (something he’s had since daz) + enma strengthens his armament by increasing his output and overflow to the point he

Sanji having the most basic form of armament but instead of specifically boosting it he stacks the toughness of armament with the toughness of his exoskeleton to develop ifrit

I think that that pattern might also apply to their other forms
- Luffy more directly just upgrading his haki
- Zoro through mastering blades that effect haki
- Sanji stacking scientific upgrades with his haki

Imo Blackbeard and his crew will be the ones the monster trio need to strengthen their observation skills against
- Luffy needing to directly improve his observation haki
- Zoro maybe mastering wado (enma’s opposite and sister blade) to somehow counter Shiryu
- Sanji maybe getting another science/lineage factor boost he can stack with his haki

As for why I didn’t mention conqueror specifically infusion?
- I personally think there’s more to conquerors than infusion
- Infusion is the most common compared to future sight and internal destruction
- Sanji is likely to get it

Roger and Xebec had 4 conquerors under them each 3 main commanders and an apprentice. So luffy is definitely going to have at least 2