Board Thread:Naruto Discussions/@comment-28861328-20140514062714/@comment-5110462-20140516104039

Actionmanrandell wrote:

they could not always use the techniques they now can but that power was always in them deep down inside them

there is no reason to believe they would have to train to use them. obito instantly mastered Kamui the moment he awakened his Mangekyou sharingan so there is no reason that Naruto and Sasuke would not be able to master their new techniques instantly

Indra was born with half of the sages powers and Ashura awakened it through hard work and determination. thats why those who combine the power of uchiha and senju awaken the Rinnegan so its the same thing. he said i will give you my power all he is saying is here i will speed up the process of their growth.

That was obito's own power, and this is the sage's power that they are using, it hasn't been implied anywhere that the sage awoken their dormant powers but rather he simply gave each of them half of his power