UPDATE: During his introductory news conference Thursday, Trestman confirmed that Marinelli has decided to move on, according to Michael C. Wright of ESPNChicago.com. Whether that means he'll head to Dallas or somewhere else remains to be seen.
When any HC joins a new team that already has some incumbent coaches in place, the analysis begins as to whether he'll keep those coaches on or replace them. For new Chicago Bears HC Marc Trestman, that involves considerations on both sides of the ball, but perhaps the biggest decision to make is on assistant HC/D-line coach Rod Marinelli.
The decision is partly Marinelli's too, however, and Mark Potash of the Chicago Sun-Times reports that Marinelli may elect to leave, owing to loyalty to former HC Lovie Smith. (Why he'd wait until now to do so would be the ensuing question). Interestingly enough, Marinelli may already have another gig lined up elsewhere if he wants it. Brad Biggs of the Chicago Tribune passes along word that new Cowboys DC Monte Kiffin is interested in hiring Marinelli for his staff in Dallas. It's unclear what kind of job title this would engender, but it's possible that Marinelli would be the heir apparent at DC there.
Still nothing official out of Chicago, but it would appear that if Marinelli is out -- by the decision of Trestman or himself -- he won't have too much difficulty finding his next gig, especially considering the results of the Bears' D this past season.