In a declaration filed with the federal action by Jahi's family, Dr. Paul Byrne, a pediatrician who has questioned the definition of brain death, said he visited Jahi's bedside and observed her responding to her grandmother's voice and touch with a squirming movement.
So he has *not* performed the brain death confirmation protocol, and has merely observed what may very well be a Lazarus reflex which does not involve the central nervous system.
If he had performed the rather complicated protocol and found what he believes is evidence of life, the situation would be a bit different. Without having done the protocol himself, he has no basis on which to claim that those who did the examination are wrong in their findings.