Marner has to be traded, or waived. Cannot bring him back imo.

It’s almost impossible to trade Marner. Huge contract and is due for a bigger one next year who would they even trade him for?

It has to be similar to the Tkachuk trade where a team really covets him, and he's willing to waive and sign an extension. The stars have to align. It's possible, especially if there is an appetite for change after another disappointing playoffs.

I guess maybe Marner for Kyrou?

It has to involve a player like that, where a change of scenery is needed. If Berube becomes the new coach then a trade with St. Louis seems likely.