Corn Flake said:
IMO, Phaneuf needs a solid, experienced defensive d-man partner who can take more of the brunt of the duties on his pairing vs. Phaneuf having to be that guy all the time, paired with the inexperienced rookies. Dion really has never been built to be the shutdown defender even though he's cast in the role and like it or not, he's the most capable the Leafs have of doing it vs. the best on the other teams. He had that partner in Calgary... he needs one here too.
Part of me wants to agree with the first bolded part of your post but the second one isn't really accurate. In Dion's first two seasons as a Flame his most frequent defensive partner was actually Roman Hamrlik. While Hamrlik isn't exactly bad defensively, but he's more of a two-way or offensive player. Especially back then. In those two seasons he scored at a 40-point place.
After Hamrlik left the team, Phaneuf spent the next two seasons playing with a Anders Eriksson, Adrian Aucoin, and Mark Giordano. None of those guys really fit the description of stay-at-home defenceman. Heck, one of them doesn't even really fit the description of a defenceman. It wasn't until Phaneuf's 5th season, the one that he was traded in, that he was finally paired with a stay-at-home guy in Robyn Regehr. And by all accounts that was pretty much a disaster. Part of that could have been because of their rumoured off-ice differences, but apparently Dion routinely left Regehr out to dry.
In Toronto the only veteran defenceman that he played with was Beauchemin, and that wasn't exactly a success either. Is that a coincidence? Probably. But I think it shows that he doesn't exactly need a shutdown guy by his side. You could argue that his best seasons came while paired with Hamrlik and Gunnarsson, reliable two-way players who can skate but aren't really your typical physical defensive defencemen.