Dahlbeck is the same age as OEL, drafted in the same draft.
At the current moment, he is a below average 3rd liner. KConn (nickname on Columbus Boards) I have to think brings more offensively than Dahlbeck with equal or better defense. I think this is an upgrade.
I like Dahlbeck as a depth dman, but since we're still got Grossman/Michalek/Elliott in the fold, someone has to be out, and we're certainly not going to be moving the beefier Grossman or the opposite shooting Z/Elliott so Dahlbeck has to be the odd man out.