For two guys that couldn't be separated, and weren't for the longest time, it has to be hard to put up unacceptable results.
I don't think there was anything festering until the coaching change. Scheifele is one of the old guard who definitely wasn't in Lowry's camp. The comment after losing every game on the crucial 4 game road trip around the Covid shutdown, where he stated that he didn't know the team's identity, was for me a shot at Lowry. I don't know how deep the dissention was at the coaching change, which didn't bring about any significant improvement, unlike Vancouver and Edmonton, but it must have made for some divisions. You've got to think another leader, Adam Lowry, was behind his dad all the way.
What I can picture is Andrew Copp, who is probably the guy closest to Scheif on the team, getting messages from his buddy Trouba in New York, saying look at us, that's a winning team, and then Copper joins it. Scheifele knows he's on a sinking ship, and losing his status with Dubois getting all the ice time with the team's top sniper, and maybe he's feeling like it's time to change the scenery. Winnipeg has never been a place for two #1 centres. For Stastny he's the consummate pro. He learned from a guy who was smuggled in the trunk of a car out of Czechoslovakia into North American hockey, I think he's a different kind of leader. One who makes people around him better.
I don't know what difference a coaching change will make on player's attitudes, but I think Scheifele wants to win, and the window here was closed when Buff, Trouba, Myers, Chiarot and Tanev left. It reopened in the Canadian division last year, but Scheif got shut down, by the league that wanted Montreal to win. If you genuinely feel you have no chance to win where you are, and you feel like you have the game of a winner, I think the end is going to be Scheifele moving on.
Wheeler's probably here for the long haul, and still respected in the room. He's the family guy, who leads the Jets family.
That's my take.