Potential bad guys and what makes them tick

So we know Panchek was a traitor. Who else do you suspect of being associated with venin or being venin themselves?

I stumbled upon this quote from FW, way before Vi knew venin were real she makes a joke:

“I certainly wouldn’t be surprised if General Melgren ripped a mask off one day and revealed he was a terrifying venin. That man has always given me the creeps”

Also Aaric’s signet and the balance law of magic would suggest that Melgren’s power now belongs to the dark side and Aaric is meant to counter him.

Do we think Aetos is venin too or just working for venin? Markham? What do you reckon their motivations are? How do their dragons come into play?

I wanna know what makes a general turn and how he can keep it on the low. And most importantly why!!