User blog comment:AYET/Will Luffy accept assistance/@comment-4899461-20150408145401

I think he would let Law help him (if Law could) because he knows Law has just as much of a reason (if not more) to want Doffy defeated. In fact, a good portion of why Luffy wants to fight Doffy are the things he's done to Law.

But anyone else? Nah. I don't think he'd let them interfere with his fight.