For the past three seasons, Lamoriello and assistants Dubas and Hunter had served as the three-headed braintrust that guided the Maple Leafs to escalating point totals (69 in 2015-16; 95 in 2016-17; 105 in 2017-18, a single-season record).
At the same time, Maple Leafs president Brendan Shanahan admits he knew all three were vying to be Toronto GM for the 2018-19 season; Lamoriello via an extension; Dubas and Hunter, 55, by promotion. When he made the decision to go with the younger Dubas, he suspected Lamoriello and Hunter would look elsewhere to fulfill their aspirations.
"Look, as much as you'd like, you can't always keep the band together. It's impossible," Shanahan said in a phone interview on Tuesday.
"When I opted to go with Kyle as GM, I suspected both were likely outcomes. Lou got a great opportunity with the Islanders. And with Mark, he was definitely my No. 2 choice, but after conversations in the last little while we decided it was probably best if both parties moved on."
With Hunter out of the mix, expect Dubas to run the Maple Leafs draft in Dallas on June 22-23. Shanahan said he will look for candidates inside and outside the organization to bolster the management team.
Shanahan also wanted to dismiss the notion that has been popular on Toronto talk radio recently that coach Mike Babcock, 55, would have difficulty working with Dubas.
"Mike and Kyle have exchanged ideas for a long time," Shanahan said. "The idea that Mike demands things is wrong. He suggests things. And the way I look at it, the more voices we hear, the better.
"I also want to address the erroneous reports going on out there that Mike reports directly to me. Mike has a standard coach's contract. He reports to the GM, not me."