Not completely I'd say. Otherwise, as others have already pointed out, he would have been able to use jutsus like Limbo or Amenotejikara. I think his deficiency was that he wasn't the original owner of his Rinnegan so he couldn't master it fully. By the way he learned to use the dojutsus available to him in a pretty decent way I'd say
Still showed better feats then others - even if he wasnt original owner , only thing he lacked is a unique technique's as Limbo or Ameno
Yep, the boy was talented :')