Zadorov and Leafs GM Brad Treliving have an obvious history, and the Leafs have reportedly been interested in the big Russian defenseman since before the season began, which bodes well for a potential deal to be struck. Treliving also has a great relationship with Flames GM Craig Conroy, which also doesn't hurt.
Zadorov and the Leafs might be a match made in heaven with what they stand to be able to do for one another right now. Big, nasty, physical defensemen seem to be a hot commodity. Zadorov is already an effective NHL defenseman in Calgary during the regular season, but his game is tailor made for the postseason.