Board Thread:Naruto Discussions/@comment-26993711-20160205011621/@comment-9782468-20160205195337

Well A is using his own chakra to make his Raiton chakra mode. So I'd say A's base form has the ability to utilize the chakra mode.

Just like Sasuke has the Sharingan himself. He isn't like Kakashi, who had his eye implanted. He manifested them himself.

Things like Sage mode, 6psm, and Kurama mode are all outside sources. They don't come from Naruto himself.