So, because he isn't that fast = he loses?
So, you also believe Minato > everyone?
Or do you believe his speed only plays a part?
Even if he does lack mobility, flying is always an option.
His speed id say is a 3, max. Reflexes isnt impressive either.
What im trying to say is that A alone would run circles around him, because the only way banshou tennin and shinra tensei is working is if they stay still, otherwise A alone can evade both attacks.
You say they can fly?. Gaara can also, and infact has used his sand to help the other kages levitate aswell. He can do the same, whilst onoki can fly by himself. Before people mention summonings, i always laugh at this. Summonings are extremely weak against ninja's because ninja's are alot smarter, faster and can outmanoeuvre any summonings, We saw sakura one hit k.o nagato's centipede summoning. We saw sm naruto throw about his other summongs. Both A and tsuande would wreck any of those summongs. The only summoning that would cause trouble is Cerberus, because if hit it splits. Lets not get ahead of ourselves though. If dust release is used on it, by onoki it gets disintegrated and that stops the splitting.
Nagato's chameleon that he hides isnt effective when gaara's chakra sensing is around. That flying bird is useless when onoki/gaara has the ability to make all the other kages fly and tbh either onoki or gaara can take out the bird