Okay well I guess I agree with you on that, so the fight won't be that easy for tsunade...but she would find a way to win.....I wouldnt say so. Sasori was able to kill most powerful Kazakage in history when he was around 15 years old. Not to mention said Kazekage could make his puppets useless with Iron Sand.
She cant do antidote in the middle of the fight.