Man log off lol.You don't even understand biology bro. Sasuke's eyeballs and brains are his own and the chakra in his brain that is realeased is his as well. It's not like Naruto who has an external chakra source inside of his body that fueles his own chakra
The brain releases new strong chakra which evolves the eyes. It makes the EYES Powerful. Yes Sasuke benefits, but the real mental, spiritual, powerful chakra is the chakra in his eyes.
That is why Sharingan controls kyuubithry genjutsu. You dont see Madara spamming his chakra trying to tame the kyuubi with his bodlly chakra. He uses his eyes on it.