What I suggest is that before one can claim a miracle occurs, you'd have to examine all the material explanations: all the laws of nature that are laws for a reason: because they are so damn predictable.
What "material explanations" and "laws of nature" apply to spontaneous recoveries from those declared to be in Persistent Vegitative States or Comas by the highest trained "scientists" in human neurobiology?
There doesn't seem to be a need for 'laws' in such a case. Those who made the declaration were wrong - either they made a mistake, or the AAN Guidelines are insufficiently exact. I'd go for the latter, if only for the reason that most definitions relying on measurement of some sort (and that means virtually any definition using human perception or measurement of a biological characteristic!) have an area of vagueness. I mean 'vagueness' in the philosophical way - where you cannot make a distinction between two terms except by some purely arbitrary 'plumping' for a number or measureable means. And that arbitrariness means that in some cases, at some time, you will be wrong. The simple example is the Sorites paradox. You have a heap of sand: take away one grain, is it still a heap? yes. Take another, is it still a heap? yes, etc, etc. Where does it stop being a heap?

When does Zack Dunlap stop being 'alive'? Somewhere deep down in his brain was a circuit that
could react and fire up his whole being. And nobody could find it, because the tests just weren't precise enough, detailed enough, appropriate enough. Doesn't surprise me, I know we don't understand the brain that well.... yet.
That's OK, I struggle to see how those depending on science for material views with regards to something they claim is in the perview of materialism (the brain) are content that they have absolutely nothing to offer the family of someone in PVS or Coma.....what hope do you have as someone driven by science, logic and reasoning when those trained in the science of nuerobiology say "There is no brain activity.....you can sign the organ donation authorization right here...?"
The motives of those who design and make the tests and make the declarations are of course only speculation and not really part of the discussion (are they?). All I can say is that if I were Zack's doctor before his marvellous recovery, I would have felt powerless facing the parents. And I am sure any normal human would have empathised and been immensely saddened. But that doesn't alter he fact that following all established procedures, to the current best of our technology, Zack was dead. The only thing I could offer them would be a hope that somewhere something was wrong, but the probabilities were very, very low. And after the marvel of his recovery, I would have been as delighted and amazed as them.
But let's get some things in perspective. There are few enough 'back-from-the-dead' cases, but are they ALL, in every land, to be associated with some religious faith in the loved ones? How many Chinese or Russian dead arise? How can you make a connection between the prayers of Zack's parents and his recovery but not in the cases of other hopeful non-religious loved ones?.
You also say "I think it does matter....you place science above all else and it comes up with zilch in these matters."
But, say, three centuries ago, people were dying by the thousand of hundreds of causes from which an escape was seen as 'miraculous'. Nowadays a quick shot, or some surgery, performs these miracles as workaday activities - at which you assist. Science does not come with zilch in these matters, it comes up with cures and technologies and life-enhancing products. The science was shown to be deficient in the matter of diagnosing the state of Zack Dunlaps brain - and there's the apparent difference of attitude twixt thee and me. I say that in three centuries (given continued progress as we have experienced) Zack's case would NOT be miraculous, because the diagnosis would not have been 'dead', it would be 'there is a problem at location X, that we can attempt to corrrect by procedure Y'. But really I think you would say the same, and not 'if you pray, you may get a miracle'.
A final point. Some years ago I was on a ship in the Arctic. Suddenly we all saw an iceberg that was a fairy castle - Neuschwanstein, Disneyland and Gormenghast rolled into one. It was a marvel. But not a miracle. The unexpected, the amazing, the fantastic can occur.