I actually don't think Shanks will save the Kidd Pirates. He's shown to be good natured but that goes out the window when you attack people that he cares about. Chapter one had Lucky Roo dome that bandit and Shanks didnt even give a little bit of a fuck. Kidd was literally ripping Shanks' fodder buddies in half in his future sight.
I don't think he's gonna be cool with them.