That's simple by teleporting inside it.I have a question for every one who sayz Minato wins?
How will he get through Susanoo?
Dont say it uses alot of chakra because it doesnt seem to be draining Sasuke.
How?
When Minato hit Tobi with a rasengan it was on his BACK. And he teleported directly in FRONT of Tobi(check the manga for proof). So this means even if he marks Susanoo on the outside,he can teleport inside it and kill Sasuke.