Oh, Hunter will help, alright. He'll set up an elaborate plan to set up Kevin, and then when the MC has to put in the final piece to take Kevin down, the MC will find himself doublecrossed by Hunter and helpless watching how Kevin fucks Aliza while Hunter takes care of the family.
The only reason why Hunter got rid of Eric is because Eric was after the same thing as he was. Hunter's goal is fucking the family, Aliza is a nice little bonus, but not the original plan. If he has to sacrifice the least favourite daughter to get what he wants, he'll do it, because that's the cold hearted bastard he is. After all, I'm sure he'll find a way to get rid of Kevin later on.
No, this is something for the MC to deal with on his own. And the less the MC owes Hunter the better. We can't have that biting in our ass later on. You do NOT want to owe the devil.