Why is it OK for angels of God to influence the outcome of games? Why couldn't God detect the sarcasm of Roger's dad's fateful words?
It's a "kill two birds with one stone" thing. The angels influence the outcome of relatively meaningless games (not influencing games that had major repercussions with one exception) to have the coach feel genuine affection for Roger & JP, leading to both of them to get a good home, as well as make the coach a better person and provide a Magic Feather for The Team. As for The Needs of the Many, the good book says "Ask you shall receive". Roger asked and, as far as we know, no one else did. God knew that Roger's dad was being sarcastic but Roger didn't pick up on it.