Don't you think that the rejection thing was just that Oro was used to a body with more stamina on it and it was only a reference for the fact that the body he's in is not as strong as his own/the other one that wasn't chosen in rush? just like "damn, my old body wouldn't be tired yet, but this one is, it sucks"

Doesn't make sense, no point in Sasuke as container and it's doubtful he would be able to just awaken sharingan in any other eye, otherwise Kakashi would have his own eye become sharingan as well and there would be no point to Uchiha clan at all.