Why on Earth would any of these guys sign the Offer-Sheet with Toronto? They're a basement dwelling team and any of these offer-sheets would destroy the future rebuilding plans they have.
Players would just see this and realize they'd be setting themselves up for a disappointing future on a lackluster team most likely.
Not only that, but TBL and ANA would just match the offersheets anyway. Unless the Leafs are offering a contract for 9M+, these players are too valuable to teams contending for a cup right now to just be given away for 4 first round picks.
The only team who maybe takes that is Winnipeg with Trouba. Everyone else happily matches right away or makes a move or two freeing up cap space before matching.
And guess what? Then, in 3-4 years when Marner, Matthews, Nylander, etc. are in the same situation, you damn well know these teams will be firing right back with some sort of crazy offer sheet just to screw the Leafs the same way.