Originally Posted by Krohnie84
Ok, I like the idea of him having trouble with the amount of chakra it could take to use such powerful eyes. < Yet that use of chakra has to count only torwards the MS. I can't think of the time where it was said that he was unable to "Keep it up". Can you show me a chapter where this was said?
It wasnt said he couldnt keep it up "use his sharingan at will". From his behavior "only using defense, only exsposing that one eye", I presented as my oppinion on why tobi is not an uchiha. Its still a mystery.