The foal is cute, but hard to critique (as you know). Only thing that jumps out at me is steep croup and long pasterns. It would be helpful to see a picture of the parents. If you are trading straight across for your mare, i personally wouldn't do it. ALOT can happen from now until the foal is ready to be backed that could hinder his riding career, and personally if you are looking for a competing horse, I'd stick with that. I think Maia is worth waaay more than this foal.