Ragnarok98
First point, what do you mean the high temperature is useless because someone has a strong body? Imagine breathing hot air from a magma, every movement in a fight requires breathing to attack Fighting close to Sakazuki must be extremely uncomfortable, and you must constantly use Haki, remembering that it is a resource that has a limit, Haki is not unlimited.
So even Zed is, in my opinion, only superior to Sakazuki in terms of Haki proficiency and as it is not a life or death fight he would have a lot of difficulty in subduing Sakazuki, and he would not be able to fight in any way with Borsalino and the protagonist to the point of subdue them, then the fight would have to be a small test to last a while and more or less test the strength of the three.