Why did Yoda...
go to Kashhyyk. I mean, he really didn't do anything there. he just stood there and watched the battle. He could have just sent his troops alone there or else Luminara Unduli, who I understand was on Kashhyyk, could have been the Jedi to go there. Yoda didn't help anyways and then he'd have been on Courscant and he and Mace would have beat the shit outta Palpatine.
Also, what've happened if Grievous would have been killed on the Invisible Hand? Palpatine'd have to excuse to keep his power + Obi-Wan would stay on Courscant. Without his powers Palpatine's plans would be ruined. I doubt he'd stop Obi-Wan and Anakin from killing Grievous, so would it be game over for Sidious then?