Again...looking at Diaz's tenure with the Habs. He was a decent player
But I don't know how to classify him...he's not an offensive dman, he's not a defensive dman, he doesn't particularly excel on the PP, in fact he's probably been better on the PK...he can make a good first pass when he's not being forechecked too hard, but when he's rushed he just gets rid of it (which is ok for a guy like Gorges or Murray, but not for a guy's who's supposed to be a PMD)
All in all...looks like both teams traded for guys who fell out of favor and needed a new scenery.
The Canucks have some injuries on the backend, so Diaz fits nicely there
Meanwhile the Habs weren't using Diaz and can stand to get bigger, without sacrificing basic hockey ability (Parros) on right wing.
In conclusion...a minor trade which really doesn't need 38 pages of discussion, but...any roster move gets over analyzed here lol