Board Thread:Boruto Discussions/@comment-25319479-20171208053034/@comment-30323490-20171210095048

Thing with Momoshiki is that people tend to overlook the fact that when he absorbs a justu, he doesn't "learn it". He is just able to reshoot the exact same jutsu that he absorbed at a larger scale. Just because he absorbed Gyuki's TBB doesn't mean that he can spam it. He can only use it once, as he did at the chuunin exams.

Even if your jutsu is absorbed by Momoshiki, all you need to do is to either dodge his version of the jutsu or counter it. And since it's your jutsu, you should know its weakness and how to deal with it.