I hope Mikey was not seen as so critical they would keep a system in place for him. That would be extremely discouraging. Playing a certain way for a 4th liner...
My theory is it's the trickle down effect. McLeod out, Jack out and,/or on the wing forces Haula up and that effectively creates 2 center holes. 3 if you call Jack to Haula a downgrade as a top 6 center...
You're going From: Jack, Nico, Haula, McLeod
To: Nico, Haula, Lazar, Nosek
I kind of think that is reason for the change. First group is go-go fast paced up tempo, second group is simply Not. Second group is better suited for a more defensive center assignments
Just a theory but it makes sense in my warped mind
I just can't ignore the timing of it all coinciding with McLeod's leave.