Board Thread:Theories and Speculation/@comment-28939725-20161201164545/@comment-25122992-20161206144710

That's already redundant. The point is that Obito wasn't that weak in controlling the Rinnegan compared to Nagato. If Senju lineage was the reason Madara choose him as Rinnegan's host, then by the pure logic, Obito, a shinobi of Uchiha lineage + with pure Senju DNA of Asura's reincarnate (which even Nagato didn't possess) should have exceeded Nagato in Rinnegan mastery if he was chosen as its host in Nagato's place.