Tsk tsk we are still underrating Tsunade. Let's say her and base Gai fight. She beats him pretty easily. Which ruins the whole her taijutsu is not on par with his argument. IF they are both taijutsu users and without power ups one loses, the other, would be the better fighter. When Gai adds his gates, he becomes much more impressive his speed and strength increase but his fighting style stays the same. Tsunade eyes has been shown to keep up with the raikage in motion. So she would not lose track of Gai in a fight. When he comes in for an attack she needs only counter one attack to kill Gai. Whereas, Gai's strongest attack to date only causes internal bleeding. Tsunade regrew her stomach, vital organs, spine, nerves, chakra points, and muscles so I don't think that punch would finish her. In addition to the fact that the punch is 1. linear and 2. Not exactly overwhelmingly fast iirc. Hirudora is useless against Tsunade. Morning peacock has less power than Hirudora so it wouldn't be successful in killing Tsunade. At worst she'd have to heal some burns. If his most powerful punch only causes internal bleeding (albeit death for most but Tsunade is quite durable), then I can't imagine his regular attacks really phasing Tsunade. It would be comparable to getting hit with Tennis balls. It'll hurt but you won't die from it. It won't stop you (unless your a guy and it hits you in the nads). So far he really doesn't have a killing move to take her out. He won't get one that won't force him to kill himself. In addition he still has no way to deal with Katsuyu. So someone tell me why exactly you think he can beat Tsunade?