Yes, it is possible, because not all medical expertise is credible.
The tribunal, being a quasi-judicial tribunal, weighs all the evidence. If there are multiple medical reports...or even not multiple medical reports; the tribunal members evaluate all the evidence, including medical reports. They also, as I stated earlier, have received instructions from the Federal Court on how to determine whether the medical opinion is credible.
That's not to say that they're questioning the doctor's ability to provide an opinion, that they're questioning the doctor's ability; it's whether or not the opinion addresses the necessary criteria. There may be more than one in an individual file, and therefore, with that and the other evidence in the file....
When I talk about “evidence”, I'm talking about documentary evidence, I'm talking about oral evidence, I'm talking about expert evidence.