10% of brain control is a lie.
Our brain consumes %20 percent of our bodys energy so if we could control our brain at %100 we would need %200 of our bodys energy we dont have that much energy and we cant carry that.Lets say we somehow got that much energy , it will cause our brains grow more and cause that our skulls crush.
Well, we do not know that for sure. Our brain is already working, I do not think that adding some more processing would made energy consumption of our brain go skyrocket. At most maybe 2x more energy, not 2000%