I think it is also impossible for Sanji to even have 1-on-1 fight right now since, in all honesty, he is already way too bloodied and battered at this point.
Heck, Usopp and Nami nearly got their face caved in and they still look better than Sanji after Black Maria was done negdiffing him.
Kidding aside, his injuries ensure me that he's not fighting anyone above the F6 alone.
Unless Oda is setting up Peji Wan vs Nerfed Sanji of course.