At U11, the 50-70 pound weight differential is legimate. You have 12-year old 5th graders who weigh 120-130 pounds (or more) playing aginst 9-10 year olds who often weigh between 65-80 pounds. I saw it this weekend.

No complaints here as my son's U11 team chose to play up at the top AA level. Speed and skill can be a great equalizer, but the grade-based change has changed the dynamic. I did not feel it was unsafe because of decent refereeing, but a 130 pound kid hitting a 65 pound kid is scary.

The result may be that highly skilled younger players may have to play at the A level. Maybe this is fine, but I am not sure it is good for youth lacrosse.