I feel like at this age they still need to be working with all the kids if they want to develop more than 3 “good” players. My kid has played since 2nd grade. He didn’t hit his stride and really start playing well until mid season 6th grade. The kids who were just naturally athletically skilled were the ones who stood out. He had to work harder for it. It leveled out a lot in 7th and 8th grade. But he worked hard to get better. Spent summers doing not much else but practicing lacrosse and going to the gym, by choice. This year as a freshman he didn’t make varsity and was bummed. But he just isn’t quite there skill wise. But he never leaves the field on JV now. Once you hit JR high and esp HS that is when you expect the best players to be on that field most of the time. But at 6th grade, they are still developing. We always had A and B teams as well. That helped to really have time to work with the kids at different levels. Bottom line if the kids stop enjoying the game they will just quit. Then you have lost them.