Mikkelson at this point is an in-betweener. He's had one full year of the minors, followed by two seasons split between the AHL and the NHL.
I would take this demotion (my thinking is that he's on waivers in an attempt to get him to the minors) as a signal that Fowler is with the Ducks to stay.
Mikkelson's on a one year contract right now for just under 700k. I'm not convinced he's a full-time NHLer at this point. The tools are there: skates well, decent at moving the puck, good size frame (but doesn't really use it), but he, to date, hasn't really taken that next step to be a regular two-way guy at the NHL level. Maybe it's a confidence thing.
With Mikkelson being the Ducks 7th d-man and Sutton not due back from IR for at least 5 weeks. I can't imagine the Ducks are not going to have a 7th d-man on the roster. I don't see this move being made just to bring Sbisa back up....so start the trade speculation! Souray anyone?