Wrong fit.
Rucinsky looked good on the Rangers, a team that would give up 20 scoring chances in order to get 15 scoring chances. But against a hard working, defensively responsible Flames team, that might only give up 5 scoring chances, then Rucinsky will be invisible. On the Rangers, he had Jagr and Lang (before trade), Lindros, Nedved (before trade), Leech, Kovalev (before trade), etc to divert the other team's attention. On the Canucks, he only has Naslund to divert the other team's attention.