Board Thread:Versus Debates/@comment-28635066-20160603012021/@comment-1512913-20160605205534

You are wrong, otherwise Orochimaru would have Sage Transformation, since he was bitten.

Sage Transformation is simply put, Jugo Clan's physical reaction to Senjutsu chakra, their bodies also absorb natural energy. So yes, it should be possible for a Sage Transformation user to achieve Sage Mode level, it's all about balancing the natural energy in the Senjutsu chakra they produce.

The way I imagine, if Jugo mastered Senjutsu, he would still look the same as in full transformation, he would just be even stronger and possibly have more pigment around his eyes/on his face.