No, they should not. There should be 6-7 U13 challenge teams playing in the spring, and these teams should get the opportunity to play the competition. As has been stated many times on this board, on any given day any anything could happen. I concede the CESA U13 team is the best in the state (in my opinion). Are they beatable? yes. Should the other U13 teams get to play them and compete? If they want to play for the State cup, then yes, they should have to play in their own age group.
