I chose the 3rd one cause its only the truth
But if that didnt happen well this is what would happen REMEMBER THAT THEY KNOW EVERYTHIGN ABOUT EACH OTHER(like battle wise i think)
So Sasori knows about kamui, so of course he would probably begin with the whole iron sand thing as a defence yet an offence at the same time. Kakashi would probably either hide or use shadow clone or substitution of some kind. WHile that is happening, kakashi is look in for sasori's opening. Know that susanoo is ALMOST impossible to dodge, when Sasuke shot the arrow at kakashi, he used kamui, so he would be fast enough and skilled enough to warp sasori. Now sasori probably killed the shadow clone(if it is that one he does.) or he would probably see though kakashis battle plan. Then he would unleash all of his puppets, and would then ready them for kakashi. Now kakashi should make like 100 bunshins(NOT KAGE BUNSHINS) as a diverson, but that probably wont happen, so hye would either distract him, conserve his energy, and then attack at sasoris blind spots and warp him. But it might now go like this because they are both very inteligent and powerful, kakashi needs to be smart in this battle, because clearly(to me) sasori probably defeated kakashi head on, and also im just adding this in, know that kakshi is the assasin type. And no, sasorri cannot switch his hearts with other puppets, his heart shall ONLY be in his body puppet because then chio and sakura would have died already. And by the way if either opponent doubts eiter one of each other, then the doubter completly lost. Difficult battle, so even I wouldnt know.xd





:hug: