Sasuke isn't Madara and also he had the power of the Juubi which isn't even HIS power. Put Base Madara against Gai and there would've been a way different outcome. He already handled his Susanoo in Base mode with Hirudora. Also were on about Lee, the same one who Deuced Madara with a Kick.
Sasuke can't follow high speed movements no way, his straight comma allows him to flow however but just remember Lee wears weights and still moves at high speed so it's not like he'll be able to follow up. Being a Gaijutsu master, Sasukes fighting speed would pale in comparison to Lees. Lee doesn't need 8th gate. Also what good is Ameno when you can't even keep up with what you're fighting against?
I'm pretty sure Lees endurance is way high seeing as the 8 gates takes a toll on the users body so I doubt boil release would do much. Also you should know Lees style by know is to blitz rather than give the opponent some good show. Naruto focuses on shadow clones, trickery and misdirection rather than aiming to deal pure damage. Lee would stomp him into the ground 5th gate.