Not a chance on those players. Larsson is too much of an unknown right now to risk a good young player. Not that Cogliano is so young anymore.
Larsson was also not a big part of a Cup run. He played decent in 5 games. Hardly a big part.
I agree that he played descent in the limited time he got during that cup run and was not a "big" part. However, his goal in the third period of Game 2 vs. the Flyers was one of most important we scored that entire post season. The Devils were on their way to a 1-0 or 2-0 loss in that game and a 2-0 hole in the series and that goal completely changed the script in that game and, ultimately, the series.