Sorry to have misrepresented you there. Yes, fair enough.
My position is: if the argument used by the prosecution was that something very unusual happened on this ward, they should probably have used someone with more than hands-on experience. Unusual things do happen, but you need to be on top of research, and not just drawing on your own experience and practice, to comment fairly on them. So leaving aside the neonatologist / paediatrician distinction - and it seems there is a significant overlap in the two roles - Evans was not the man for this case. I'll omit any other comment on his performance, since I'd like to address your point.
As to Lee, I'd be as happy with "internationally recognized and respected", but world-leading has been an unavoidable term in all areas of academic research in the UK for twenty years now, medicine included. Blame the research councils. And Lee's academic endeavors are important here since he wrote the famous article, and its recent update. It's not hyperbolic to say he is better qualified to interpret these works than than anyone else concerned.
In terms of his roles and experience, I think it's a bit of a red herring anyway, because, beyond the interpretation of his own article, all of his contributions have been as part of a wider committee presenting a consensus view of each case. For "hands-on", I was impressed to note one summary which made its argument based on records of the state of the child's nappy. Good practical stuff where needed, from the international panel; cutting edge research too.