I may lack ethics here but if your kid can play a sport at school number two and really wants to and can’t play at ED school then bailing on the ED school won’t bankrupt them.
I mean I don’t think you should go in planning something like this but it sounds like new info/opportunities have arisen.
ED is a college scam set up to only benefit colleges—promise you’ll pay and we might let you in! I don’t feel bad for the ED college at all in this situation. I’m sure they’ll find a replacement student in the next 9 months!
And I don’t see any harm to the ED college coach since your kid wasn’t being recruited by them.
But I don’t know the legality/contract issue at all.