I dont like it when people write Law alinging with Luffy as him looking for a crew to use and dispose of easily for the sake of taking down Doflamingo. For starters, he orginally went into the take down Mingo plan trying to do the entire thing on his own, Luffy was a happy accident to his suicidal plans. And furthermore, the literal moment that he doubted if they were all going to make it out of the plan alive he sent some of the weaker members (with Sanji to protect them) on ahead to Zou, and then turned around and immediately tried to back out of the alliance with Luffy so that Luffy and the rest of the crew would leave too and Law would be the only one to die for his revenge.
He never wanted anyone else to die for the sake of his vengeance, not his own crew and not another crew either. And because of that he could never genuinely see the Straw Hats as "disposable" in the callous way some people write it where he doesnt care if they live or die. Its the whole reason why his original plan to take down Doflamingo was built on having Kiado do it for him, because even if Doflamingo killed him once he realized what was going on, any allies or crewmates of Law's at the time would not be caught in the crossfire if he could help it.
Disposable doesn't look like that. If anything, he was treating himself as the disposable one
