Every other core player that was kept after the Cup and identified as being the core - Toews, Kane, Keith, Seabrook, Hossa, Sharp, Hjarllmarsson - has been expected to 1 - improve the game and 2 - produce consistantly. Keith had a bad year last year, and it was said him to be hurt a good portion of the season - but he was still taken to task for falling off.
Seabrook's game elevated. Sharp's improved. Hossa slumped last year...but the rest this offseason has him back to elite status. Toews and Kane's game both is at another level. Keith has had a very good bounce back year, showing last year was more of the fluke than all the others.
Hjalmarrson after cashing in on the cup contract at 3.5mil - should be more than just a shot blocking defenceman. And, IMO...Bolland being kept with the core - when Ladd with 29g last year, Versteeg 33pts in 30gms this year, Byfuglien with 74pts in last 121gms from the blueline - were let go.