Per Arpon Basu:
One truth the Canadiens were working with was that Dubois wanted to play in Montreal. But at some point in this process, I’m told, that changed. Playing in Montreal took a back seat to getting the contract Dubois wanted and going somewhere he perceived as being the shortest path to winning.
There were multiple complications for the Canadiens. And it is worth stressing that this is not a situation they asked for; this began when Dubois’ agent Pat Brisson said on live television a year ago that his client would like to play in Montreal. This should have been good news for the Canadiens, but what transpired since that time is that Dubois clearly realized he is not willing to play in Montreal at all costs. His contract was clearly more important.
The Canadiens were willing to play ball on a Pierre-Luc Dubois sign and trade, but ultimately the cost and timing did not suit them.
theathletic.com