Minato put the fear of God in B and A, if minato wanted to he could have killed B before B had a chance to point a knife at him, also people seem to forget that minato can teleport back to his hideout if he wants like wat he did when the fox attack. he has markings all over that place, also A proved that once he gets into retard mode he will do stupid shit like attack sasuke with ameterasu shield up, minato would just to get him riled up and then finish him off, also minato can use sage mode, imagine sage mode with FtG can you say op, plus minato has lots of contract seals and space-time ninjutsu barrier so he wont take damage man minato just too cool he is unbeatable