Interesting would be an understatement :/
So I think that means at least 5 people who became gym leaders (El, Radomus, Serra, Saphira, Sigmund) did so for purposes that had nothing to do with an affinity for Pokemon -- something that they may well have not even possessed given each of their reasons for joining in the first place. After hearing all this, I wouldn't be the least bit surprised if IRL Bennett was also involved in that mess. I'm not sure about GG though, because she used to be very vocal on the forums; and I would think that she'd have mentioned it somewhere at least once.
EDIT: @Farnsworth
Oddly enough, I can't remember running across Radomus or Gardevoir on the server. I suppose that was because my online sessions never coincided with their schedules; or I just saw them so infrequently that I don't remember them at all. Also, I think the season was well underway by the time I began challenging leaders, so it could just be that I didn't have many opportunities to see them online. But if that's what GG's trainer card said, it's most likely true. As for Radomus being her ace... there were a few strange things on the leaders' trainer cards if memory serves, so it's probably just that -- some intentionally strange text. Actually, I'm pretty sure El had two cards, with one of them (as Elias) talking about how he's employed as a butler to Radomus at Vanhanen Castle -- hence why he plays that very role in Episode 10, almost 4 years later. I don't know of any other instances of trainer cards mentioning other leaders by name. Perhaps IRL El did that to feign civility towards Radomus and to give Luna some sense of security? Not too sure. It's weird, just as with GG's card.