Would we want Tavares? Not really, right?
No, there's not really anybody on Toronto that I'd want (under the assumption that Nylander is the last guy they'd be willing to part with).
It's more of an aggregate. If a handful of teams suddenly want to wheel and deal this summer, it promotes the type of trades you don't see as often, and hopefully Detroit can take advantage somewhere (even if it's via a domino effect, with a team that would not have otherwise considered the market, but then jumps in once a few others do).
For example, if a guy like Werenski sees Mitch Marner force his way out of town and into a good situation elsewhere, maybe he's more vocal about not being happy on a lousy Columbus team. Slim chance, but the more movement there is, the better the odds that something clicks into place.