I didn't say stamina I said durability, and if we are on the topic of that, Zoro on the rooftop had exhausted his stamina completely, while sanji fought fodder, so as far as that goes there isn't a huge difference imo.
Sanji got a healing factor after his bones were broken from Queen, and his injuries were otherwise unexceptional. With the mink medicine and King fight Zoro's taken more damage, Oda's kind of shoved his injuries down our throats throughout the raid.
And if the mink medicine hasn't kicked in... it's still a win-win since that'll mean the grim reaper stuff still has potential.