I think he could pull them off OK, but maybe he's afraid he's going to have the same problem he had after the 1976 tour. It would not be good for his voice to do Helter Skelter too often.
It's a good idea to do more RnR Thomas! He didn't do anything from RDR, but you guys said Honey Hush sounded awesome on the secret site. Long Tall Sally, I'm Down, Kansas City, Run Devil Run, Clarabella... that would be something.