Personally, I like the sports nerd nice guy idea better - he's more just seems more likely to be able to provide real advice. If you write him in the spirit of the protagonist in Katawa Shoujo I don't think he'll come off as weak. It could create some opportunities for her to save his butt and vice versa - creating a solid bond if not romance.
Nothing wrong with the two friends on the team (actually somewhat likely since Japanese tend to isolate themselves to their "club" and "classroom") - You would want to make sure they stand out in their own way (e.g. chaotic on the court, brilliant but undependable, accident-prone, team clown, etc).
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