Your chart is off by a year (17u are 2016 grads), but I don't think they look at it that way. They see a talent they like, they'll ask or look at the roster for his class.
Actually, they DO look at it that way. Play with your class.
If you're playing in a 16u tourney, it's very unlikely that your teams grade level is otherwise given away anywhere. I doubt many recruiters watching a 16u tournament game have gone to the trouble of researching individual teams to determine their actual age bracket unless they do so by looking at the roster and at that point they've seen actual classifications. Plus, are you really implying that if a recruiter sees a hot Junior prospect he's going to pass or otherwise discount what he just saw on the field based on the fact that other kids on his team are sophomores?