I think it's still a bit early to have Luffy fight Big Mom. He's strong, but I don't see him winning. He had to use Gear 4th and needed Nami's help just dealing with a Commander of her crew, and he was in perfect condition back then. Big Mom's Devil Fruit power is not as effective against him, and her Lightning would also be ineffective, but even in hand-to-hand combat, I see Big Mom being stronger, especially considering he's already taken a good amount of damage and he had trouble even besting Doffy. That, and the humongous size of Big Mom's crew with many Devil Fruit users against only half of Luffy's crew, with some of his stronger members not present, puts him in a pretty disadvantageous situation.
But I also can't see him running away, especially with Fishman Island on stake. It also seems like an impossible task to escape from Whole Cake Island. There's also the whole deal with Germa, Brûlée learning about Poneglyph being copied and Pedro's shortened life. I'm thinking it will somehow come to the Germa helping Luffy escape, and Jimbe somehow convincing Luffy to not fight yet. No idea what would happen with Pedro or Brûlée though.
A-Man wrote:I hated the drama with Sanji making the "difficult decision" at first, since I couldn't see how Sanji expects Luffy to just leave. He should have thought that since he believes Luffy is truly to become the pirate king, then he'll probably have to face Big Mom or even stronger enemies sooner or later.
It also made me angry, but I actually really liked that. With his hands at the risk of being blown away if he tries anything, Baratie at risk, even the Straw Hats being against a Yonkou, who has a lot of smaller Pirate Crews under her command, I can see why Sanji would be confused on what to do. I don't think he actually expected Luffy to leave, but he just hoped for the best and tried all he could. It's a situation similar to Kuma and Zoro's, where Zoro was willing to sacrifice himself and his dream for Luffy and the Straw Hat crew. The differences here are that a lot more is at stake for Sanji personally, and that Luffy isn't out cold and is capable of intervening, which is why it doesn't go the same way as it did back then.