Markstrom has full control over his location and I would rather keep him to mentor Wolf the same way Rinne mentored Saros and how Gibson is currently mentoring Dostal. Marky has already proven to be very good at that role in the way he openly supports, encourages, and offers advice to his backup when he is on the bench, while also not taking it to heart that he is not the only playing.
Kadri will be next to impossible to move due to his age and term. Edwards will never let us retain on a deal like that either.
I have no issue with short term additions for stability but our main focus should be adding players drafted in 2018 and forward. Like I think it's pretty likely Kylington signs and extension almost out of loyalty and to prove himself again but I would not be particularly interested in someone like Sam Girard, Morgan Frost, or Casey Mittelstadt for example. If we wanted to get a Girard like player we would probably just extend the strictly better player in Hanifin. And someone like Frost or Mittelstadt aren't legitimate 1C's, we already have Backs and Kadri who can eat those top 6 minutes at center but we will need a true 1C in the post Lindholm era at some point, and trying to band-aid that is just not a viable option.
There are no UFA centers of Lindholm's caliber or higher hitting the market any time soon with the exception of Draisaitl who probably wouldn't sign in Calgary anyways. Best bet is to draft one or trade for a prospect with that potential.