Every player is different. Rudy is a tall long person. His body isn't going to hold up when he gets hit low. He needs extra support. If you haven't seen him play and cringe when he gets hit I'd be surprised. He obviously could benefit from it.
My brother is the same shape as Rudy and his knees were destroyed in high school and college. Now he only plays with braces. He's not been hurt since.
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Yes, anecdotal evidence is always correct. Please, tell me more about your brother. I care so much.