If Kaguya wants to play with dimensions, perhaps she should confront Obito with both mangekyous. I think Obito will be much stronger with his two eyes. He may even be able to access other dimensions with them just like how madara was able to make 4 limbo clones when he obtained both rinnegans, but was only able to make one with one rinnegan. We might also see Obito's susano