Do Hiruzen and Tsunade stand a chance against Minato?

[Chatte]

Him being immobilized has nothing to do with zabuza cutting his head one with one swing using nothing but his mouth. The fact that he did it shows that kanui can quite easily cut through bone.

Even so, Minato could quite easily get behind tsunade with FTG and do what he was going to do to Raikage.

Sure, than this fight finishes at cutting the heads, right? All the fights till now should've finished there. And everyone brought that to the matter because they saw there's not another way to kill Tsunade when it comes to that.
However, if he can get past behind her, what stops him for falling under the same predicament as with Bee?
Not to mention that he can get behind her IF he had placed a marking on her.
And the kunais can easily be dispersed by Katsuyu so there it goes his FTG.
Tsunade already showed that she knows the of Yondaime's techniqes.
You make it sound like Minato has no weaknesses when his biggest weakness resides in his biggest jutsu.

 

[Lilt]

Minato doesn't have the offense to put Tsunade or Katsuya down. Old Hiruzen makes little difference.