Mercy super jump just looks weird and if it exists, it would logically (not from a balance perspective) make sense to be able to do it without a teammate. I personally think it should be removed. Super jump should not be a thing, only the bunny hop at the end of a guardian angel. Super jump gives Mercy a very unusual method of vertical mobility that she is not supposed to be able to do with GA. Need to buff her in another area to compensate? Sure.