3t sasuke pushing him back means he was near blind madara. Otherwise madara would just kick his ass away or shushin away. Same for 7th gate guy right now. He had to be near madara's speed that madara couldn't simple shushin back, or 1 shot him like when madara tried to ftg v2 madara.That doesn't really matter. 3T Kenjutsu Sasuke was able to push back Base Madara, but that sure as hell doesn't mean he's a match for him.
And Madara merely said that Gai was underestimating him if he wasn't going to go all out.