Minato and Tobirama.
Reason: FTG.
So many people forget this part of kakash's fightning style. Anyway let me add gaara. He stopped a massive bomb from destroying the villagekakashi would send a clone out as he always does
Well to be honest, it was more of a set up fight.. rather then 1 vs 1...... 1 had the information on the other.
Any with defence capable to withstand couple paper bombs at once, plus wide area jutsus, S/Ts, Jinx. List is actually too big.
Naruto, Minato, Muu
Thats probably it
So many people forget this part of kakash's fightning style. Anyway let me add gaara. He stopped a massive bomb from destroying the village