Yes of course. But I am not familiar with him and from what I've been able to glean from Shere joining the Smug Club he just as likely try to screw Greevil to keep money flowing to his coffers or switch over to something else.
But seeing that in however long he's been a King (as far as I'm aware) he hasn't made any efforts to avoid putting his eggs in the oil money basket I can easily see him jumping into the role of antagonist because Greevil would take away his power/influence. I could even easily see that he hasn't put effort that could have going into Green because he's using resources to suppress Green energy.
Giving the guy a forewarning brings to mind him putting money in sabotage, assassination, counter campaigning, bribes, and bad stuff.
Because I'm pretty skeptical and pessimistic about a villain not screwing someone over.