Can intelligence accelerate to the point of ultimate intelligence or AGI without more innovation in the body?

I think the short answer is no. If you were just a brain in a jar and you never touched anything, do you really know what this and that is? You know, it's a lot harder to have a body than to have a mind. A real body has to move through physics in real time. So all these things are difficult for AI, and they're gonna take a long time to master.