BorutoIsTrash
Personally, I would have left him the amaterasu, I would have only combined the abilities of launching and controlling it, and in the other I gave him another power. I say this because almost the same thing will happen with the tsukuyomi as with the amaterasu, right now it is powerful because they are normal ninjas, but against obito madara kaguya and the rest of the otsutsuquis it will be of no use. but hey it's your story so do what you want