I would hope Dubas pursues Keefe to be an associate coach, but I can pretty clearly see why Sullivan would massively fight that. Keefe being added to the staff would be a clear “we have your replacement, don’t f*** up” move directed at Sullivan, which I think they should do but Sullivan will absolutely not react well to it.
That’s actually why I think Dubas won’t go after Keefe as an assistant. I think he should, frankly he should be willing to fire Sullivan and replace him with Keefe but even bringing him on as an assistant is good. But I think Dubas realizes that Sullivan wasn’t happy about Dubas firing Rierden, and adding Keefe on top of that may cause even larger issues.