Sanji doesnt fight women and even if he did he could never even put a scratch on Linlin ............
I just answered this. I guess I thought I posted it. I'll try to remember what I said. First, that is a weakness Sanji has. Apparently not being strong enough to get through her "iron skin." Of course this would not be a one on one but he'd be a main fighter. And I'm glad you mentioned that Sanji probably couldn't get through her thick iron skin. It proves that Oda may have to do a little more work on Sanji. Not his backstory but him being more established in the new world as a threat. Especially when you consider Jozu was the number 3 or 4 for whitebeard (including whitebeard). Remember Sanji said he'd be a threat to the world gov't on thriller bark. Oda needs to make that hold true. His writing is great. Just that he may be neglecting in terms of abilities Sanji, Nami and Usopp.
I really think Sanji should get a Devil fruit. Mythical Zoan. And make the raid suit have the ability to nullify devil fruit's user's inability to swim.
Now when it comes to not fighting Big Mom, that may not be true. Sanji's training with Ivankov may be underestimated. He is a top revolutionary, stronger as or stronger than Kuma. Kuma and Revolutionary training sure worked on Sabo. And Sanji's been training all his life. Here's the thing though, in Enies Lobby, Sanji fought Kalifa and lost due to refusal to attack her. Nami said, forget his pride because it will get him killed. We saw him use swords in the Wanze fight only to find out he was trained in swordsmanship. We saw him call himself Mr. Prince, only to find out he was a prince. I'm sure Sanji did fight against Ivankov. No way, Sanji had someone strong training with him and he didn't spar with them. Same with Luffy and Zoro. Now Ivankov is perfect for Sanji because Ivankov switches genders. So to beat Ivankov or survive Ivankov, he may have had to overcome his refusal to hit women. I'm sure Oda plans these things. It may be no coincidence that Sanji fought Mr. 2 who would transform into a female face during their fight to deter Sanji and then he trains with the strongest okama. So he may be willing to fight Big Mom. He said it, these are yonko and you can't be stubborn. So if he throws away his pride then he may be able to protect his friends. That was right before fighting pageone. So who knows what Sanji will do. She tried to assassinate him and his family. Even though he only loves his sister. He does have a soft spot for them.