I have to disagree on the value of C at 8U (no D3K, no stealing home). A good catcher puts a dramatic limit on base stealing, turns short bunts into outs, and keeps the pitcher's head in the game. Although it's rare to find an 8U catcher who can reliably make a strong throw to 2B, a good 8U C can cut down runners at 3B with some consistency. With a C who lets a lot of balls get away from her, and is slow to get them, a single becomes a runner on 3rd nearly automatically.
Reason I rate C down in 8U is that in most 8U - including most travel - there is no stealing at all. And no bunting on coach pitch. So there really isn't any value to catcher. Now if you are doing kid-pitch 8U and have stealing that is a different matter but we don't see any of that locally - and if you can pitch in 8U they'll likley play you up in 10U in rec.