Muu the Invisible Man and Third Raikage would both beat Minato (no Bijuu).
Can’t be seen, can’t be sensed either, can fly. Can split himself in a heartbeat even after getting hit by a Rasengan. Has a one-shot move.
Minato has shown zero firepower to take down 3rd Raikage. Dude fought Hachibi to exhaustion and implied only Bijuudama-lvl firepower can hurt him. Minato loses in a war of attrition. Sealing him leads to a stalemate.