Just a few thoughts. The patching can definitely improve amblyopia but may or may not help the esotropia. If it is accommodative esotropia, the glasses often work quite well but for the average case of congenital esotropia, surgery is sometimes needed. Make sure to be seeing a pediatric ophthalmologist and this should be a fairly routine case for that type of MD.
He is seing a pediatric opthamologist. He said it's NOT accomodative because his vision is fine, no focus problems just the left eye being 20/25. What I still can't get from the DR or the research I've done so far is how common is it for this to appear all of a sudden at 6 yr old? Most everything I read is for cases w/kids under 3. MRI was normal but should I still worry this appeared due to a disease?