Sounds like an interesting fight. The thing about Gurren Lagann though, is the harder you hit it, the harder it hits back. The spiral energy that shapes it comes directly from the spirit of those that pilot it, so as long as they have the will to fight, it can just get stronger and stronger. Hell, even without the mech, the guy who pilots it had so much fighting spirit that he was able to fist fight a god and turn his blood into a drill.