I’m not so sure this is a big deal and there are other issues with the judgement that should maybe be focussed on. Sports law is a pretty limited field with a limited number of clients so over a career I imagine a lawyer will represent plenty of different clubs. Unless he is still retained by them (I don’t know if he is or isn’t) the fact he once represented them 15 years ago doesn’t infer any lifelong affiliation or anything.
I don't think that acting for Leeds more than 15 years ago should preclude him from sitting on the commission panel .
However as soon as Leeds applied to join the action and he realized that they could have a potential claim I am genuinely surprised that he did not recuse himself or the Everton did not ask for his removal.
If this were a criminal matter I do not think a judge would sit and hear a case where he or she has either previously defended or prosecuted the defendant.
A slight tangent but jurors are specifically told they cannot be involved in any case where they know the defendant or any witnesses.
So yes , on balance , I'm honestly surprised that he continued and was allowed to continue to sit.