OP's sons are playing in college, just not at D1s. I think the argument here is about D1; there are plenty of opportunities for all sorts of players in the lower levels.
All the HOF examples are true, but I think there are plenty of 6'2"+ pitchers cruising 90+ with great work ethic. They don't all have success, but it's more of a risk for a coach to take a chance on someone who doesn't fit that profile, if they haven't demonstrated anything else in their pitches, as others have said above.