How do you propose that investigator to unearth this "any type of affiliation"? Certainly it is a common understanding and agreement that shared nationality shouldn't be a strong enough proof of affiliation?
Should he inquired to Finnish DVV, see if he shared lineage with one of the player? Or perhaps, since he can't get an official warrant to scrutinize newfish1's personal things, hack into the his phone and search for his communication history, see if there any trace of communication between him and the involved players?
I think we’re at a dead end here. We don’t know what happened and won’t know unless newfish were to reveal his true identity. I don’t know who is right and have nothing more to add.
What good does it bring? Revealing his true identity. Fairlay hired a private investigator with an aim to prove that the match was fixed. I don't think that investigator will bother to read here and put newfish1's defense as a point of consideration, and I am sure him doxxing himself will not be in any part that the PI's findings report. If any, it'll just make newfish1's situation worse by having his true identity revealed to an open forum.