To me, it matters not, you simply have Seider take shifts with the other guys to keep him on the ice more often. Same way they did with Lidstrom, or any team does with their top end defenceman, he played with a regular partner but always played way more cause he also had shifts with everyone else. I agree, lately Walman's defensive game has been a little off and he seems to be making more mistakes lately, but Chiarot is only playing ok and Petry really isn't playing well at all.
I mean even 38-39 year old Burns is close to Seider's average ice time this season. I get it is only Seider's 3rd season, but not sure why we always need to be so slow to move good players along in their careers. Good players are good players let them play.