that is your opinion. if he manages to mark the sasori puppet, and he can, a teleportation and rasengan won't leave sasori enough time to do that jumping outt thing he does with his heart.
sakura and chiyo managed to dodge all of sasori's attacks (sakura with chiyo's help). and she got hit once with iron sand to draw in the third kazekage puppet.
minato is smarter,faster,and has teleportation, meaning he's even harder to hit. although admittedly he has no knowledge of sasori, but then again, chiyo only knew up to the hiruko puppet and even then she didn't know all of his hidden techniques. the edge sasori has is that minato might not realised that sasori is using poison and gets careless, but he doesn't seem the type.