Better wait and see the next chapters...
Honestly, Law will probably chill and medic himself and Kidd a little bit, after that he could stay as a medic until the raid is officially over.
Kidd could get some medication by Law and... Don't know(?)
Nobody in Onigashima deserves Kidd's fighting presence as of now, aside for Kaido. But I think that SHs together will fight him.
My Kidd fan side makes me wish that he reaches the rooftop and lands another brutal hit on Kaido, for Killer, but my rational side makes me doubt it.
Even if he stops bere I'm good with it. He has been a menace the whole war and Just defeated an Emperor in a 2v1.