They didn't have a spare Cole lying around? There's been rumour they'd been interested in getting rid of Horton, could that not have worked as a deal similar to move Cole?
Told by NHL source that Bruins inquired about Michael Ryder but price too high. Believe there is still interest in Brendan Morrow from BOS.
Dallas was looking for a forward who's tougher to play against. They see that in Erik Cole and give up the upside of Ryder to get him.