Per The Fourth Period's David Pagnotta, Blues GM Doug Armstrong was spotted at last night's Blackhawks/Leafs game in Toronto. It's worth noting that a team's general manager typically does not attend a game in person unless he's there to scout a specific player or players himself.
We know that Brad Treliving has been looking for a defenseman since before training camp, so it would make sense that the Leafs and Blues are ideal trading partners. The question here is, who would the Leafs be targeting? Each of Parayko, Krug and Faulk contain a $6M+ cap hit, which would be extremely difficult for the Leafs to take on without some serious salary retention, as well as the Blues taking back a pricey contract in the deal. The problem there is that the Blues are also very close to the cap, with just $291K in available cap space.