Sounds like a crappy situation. I just joined an BCA league this spring. I didn't want to join the APA simply because many of the APA league shooters I know ALWAYS talk about laying down or sandbagging. I joined the BCA league because every BCA player I've talked to (I know far more APA players than BCA players) seems to want play to get better, no laying down, go hard or go home. I like it like that.
I pretty much took sandbagging as in integral part of the APA, seriously. And I think that might be the problem here. For example, and I could be completely wrong, but sandbagging seems to be such a big thing with the APA that maybe the LO thought your team mate was sandbagging. If he wasn't, maybe he should have and this thread wouldn't exist. I'm just saying.
From what I've read I believe your team mate was playing the best he could 100% of the time. Maybe he should look into another league that's composed of better players and players who want to win the right way.
I'm not sure how this BCA league is going to shake out but if I think I'm being cheated,my next step would be a TAP league or I would just get more involved in the local open tournaments being held at the bars and pool halls. Their is always a chance of winning one for the C+ to B players so it keeps me interested.
Anyway, these are just my thoughts and since I'm a baby in the pool league world, I could be totally wrong.