Board Thread:Television/@comment-11220539-20171103051010/@comment-3048593-20180603033233

I figured the deal worked the same way as to how Robbie gained the GR powers. If one wants the powers, the Spirit wants something in return (Robbie wanted revenge, so the Spirit resurrected him in return for dealing with the Darkhold, which happened to be part of Robbie's revenge). An exception being Mack of course, who got the powers without asking for them. And by what was said when Coulson's deal was revealed, it implied that the Spirit wanted more than just Aida being destroyed because of her being a product of the Darkhold, by possessing him, and Coulson not knowing the reason for it.