First of all it's Billy Cranston. Second, at the start of the show he he didn't have and self-confidence in his abilities. And anyone that have self doubt, can vouch and say that it brings you down entirely making you feel defenseless and hopeless. Third, later in the show, he end up being a super great fighter, and he became even better in the movie. As a ranger, he wasn't weak, just didn't have confidence in himself. And even Zack who was strong and could fight very well didn't have confidence and it messed with him. But he gained it back and was able to to his competition. So Billy was never weak, just shy, non confident, but he sure damn was smart and his brilliance helped the team greatly. So anything else your irrelevant ass want to say?