I feel the opposite. Usually the new guy is a lot more willing to move out long term pieces. Not to get rid of them, but to clear room to put his own stamp on the team, and change the guard.
Or they let an interim guy do the dirty work, like trading fan favorites.
The timing of this sounds to me like CBJ may go into sell mode, including their captain Jenner.
Many of their fans didn't want to see it, but it seemed to me like this course of events was a strong possibility. Including Jenner potentially seeing the writing on the all and asking for a trade, instead of being part of another rebuild/reset.
If things were to remain status quo, with no big moves, I feel like Davidson would have just let his buddy Jarmo finish the season, and make a change in the off season. Why embarrass him to an extent, if you don't plan on doing anything differently?