Rumour is he was pushed, not poached.
I've been critical of Mulholland. His recruiting class of '15 was one of the worst I've seen, with barely a single success story among them. The loss of Bird was poor. And his comment during the Merrin negotiation of "highest paid forward in our history" was unnecessary and unprofessional.
That said, he inherited a salary cap nightmare, and is one of the very few (nay, only?) people from outside the insular boy's club appointed to a key, influential role in the organisation. Disappointing to see him go so soon.