That he is a brilliant doctor who was able to diagnose Justina correctly with his keen clinical eye without doing the usual tests and everybody's just now realized that? I really don't know, I still haven't seen any of her medical records.
It might have been good to have everybody coordinating and cooperating and working together all along but I suppose it could have been difficult in the litigious situation.
On the other hand, it could have been good to have her care directed by some new people altogether. Both her original doctors and the people in Boston Children's are probably feeling somewhat invested in proving they're right and if the family threatens to sue everybody who doesn't agree with them it would take an extremely brave man to say, "Hey, I was wrong, Justina doesn't have mito, the new evidence suggests something else is going on here", if that happened to be the case.