MS
1%er
But they can make it work. You have even presented a way that they could make it work if Roussell comes back and the Canucks remain fully healthy and require a roster move.
The way to kinda sorta make it work would be carrying a 21-22 man roster, having no defensive depth, and basically no ability to call guys up from the minors when short-term injuries inevitably happen. That would be a complete mess and teams don't do it for a reason because although it might look good on paper in September, it doesn't freaking work in practice.
The team would clearly not want to be putting themselves in that position, especially given the theme of defensive depth that they've been beating for the last year.