What else can Kidd do? He genuinely shows gratitude for Zoro- he gives up his massive ego to work with team and follow Law's plan, and then he leaves for BM, too. After the initial 1000-1001 chapter, Kidd has been very respectful and cool as a teammate to everyone lol
And whaddya mean? Zoro was laying on top of broken boulders n stuff at the end, with everyone else surrounding him on the ravaged area.