I believe the sharingan and rinnegan being present in the 10 tails mean the uchiha got there eyes from the beast, not the sage, which is why they are so prideful and tend to be on the darker side by having to rob eyes from each other to gain the ultimate sharingan etc.
Ten Tails: Why You Should Care.
I believe the sharingan and rinnegan being present in the 10 tails mean the uchiha got there eyes from the beast, not the sage, which...