Sullivan's owed, what, like $10 million for the final two years of his deal? FSG is reportedly worth more than $13 billion collectively, as of October. It's not about money.
I just think it's a case of them not knowing a damn thing about hockey, combined with not really giving a shit beyond the "hey cool we own another ~thing~, hopefully when we sell it we make a big profit in a few years" aspect.
I genuinely do think they believe Sullivan's a top tier coach, and I think they believe Dubas is some young GM prodigy. Given how they immediately tossed aside weeks of interviews with other GMs in order to drop everything and pursue their guy in Dubas, I have to imagine they'd side with him if Dubas wanted to fire Sully. I just don't think Dubas wants to fire Sullivan. /shrug