2 ) he took. Even removing the general plot armour Luffy seems to have, his durability has been presented as consistently top tier in Part 2 such as him enduring a strike from Big Mom in Gear 3rd better than Queen did. You could say Jozu ought to scale from this, which I wouldn't doubt, though he doesn't quite seem to have Luffy's level of stamina. I will say you're right about Busoshoku Haki being where Jozu shines though, considering we have yet to see Gear 4th Luffy make an Admiral or one on their level bleed after breaking through their defences simultaneously.