The last time DET poached an assistant from the Isles it worked out great for them and badly for us. Detroit was terrible for years and then grabbed Bill Torrey's assistant GM, Jimmy Devellano, to run the show for them. From that point on, DET's trajectory was up and the Isles was down. In retrospect, the smart move for the Isles would have been to let Torrey go and promote Devellano to be GM. But that would have seemed like a crazy move at the time and the fans would have revolted.
Ironically, Devellano's first two draft picks for DET (in the 1983 draft) were Steve Yzerman and Lane Lambert.