Lol, are you serious?
Anyway, I don't think Luffy will crush the tea-party, but I am hoping someone else crushes it. My bet would be Kidd, as he was mentioned already, or Boney, because I still believe she will join the Straw Hats (And it would fit perfectly in the theory that there will be a Woman Counterpart of Sanji vs Zoro, for Nami), and that would place her on the Straw Hat's trajectory.
Either way, I don't think Big Mom will be defeated. If Boney goes there, I believe she will be trapped (Kinda like Hansel and Gretel, as she loves to eat and Big Mom is filled with candy). If Kidd goes there, I think Big Mom will be able to flee or escape somehow, but with that I'm less sure.