T.N.
Well 6th grade IS about the time when it stops being about sportsmanship, and 'everybody gets to play' primarily, and that 'winning' aspect comes into play.
So It HAS been my personal experience it can be a difficult transition for families (especially with the oldest child) to get used to that winning aspect.
And yes, he IS basically saying you aren't good enough so I'm replacing you with someone better, sigh, sorry.
But then that's why TRY-OUTS begin at this age as well, and learning to cope with disappointment can be tricky when it's always been just sign up and play.
Playing in different districts he's taking ONE team that represents his ENTIRE organization. It will be much more competitive, and it WILL be about winning.
I'd like to say it gets better, but high school athletics are COMPLETELY about winning.
:(