I think the SHs outside Luffy, Zoro and Yamato can at least hurt/irritate/itch a weakened Kaido a bit... They can act as decoys/distractions in order for Luffy, Zoro and Yamato to land cleanly...
But hey, if Usopp, Chopper, Robin, Franky and Brook awaken (or whoever among them will awaken) their CoA before they clash against Kaido then they alongside Sanji and Jinbe can target the scars made by Zoro and Oden (like how the Scabbards did) altogether... Nami (the only SH I suspect not to awaken CoA) has Zeus which I think can itch a weakened Kaido...