It doesnt make sense unless the web is fireproof. Also doesnt make sense that random gifters can keep up with Sanji. It's just there to keep him occupied and away from the roof like with Jinbe.
Keep him away from a fight he doesn't even belong to begin with. Same with Jimbei.
This fight is between the WorstGen and the Yonko.
Also, this man Simpji was struggling against the weakest F6, Pay Pay, for fucks sake and he almost got neg diffed by a no name attack from King who is supposed to be part of an extinct race and almost definetely has an OP hybrid form.
I've said this countless times and I'll say it again:
Sanji's forte is NOT FIGHTING PROWESS. He's more into cooking and simping like the good goofy anime pervert character that he is.
You can compare him with Usopp, Chopper and Brook. But never with Zoro and Luffy.