To fight the weakened weakest calamity, probably just for a while since i doubt Jack used his hybrid form in Zou.
Zoro is in a worse shape. Unless Hiyori has an ability similar to Mansherry or Marco sacrifice himself to bring Zoro back to full health, Zoro's major role as a fighter just ended. He might defeat a Tobi Roppo, deal with Orochi or cut Kaido again with Yamato.
Not so fast, Zoro has to deal with Orochi. I'm going to enjoy that while Sanji fights King