Well, I come back to this thread and it's just exploded.
Thoughts that Schwartz isn't demonstrable. At Nylander's age, Schwartz had half the number of points. That's not to say that he won't flatten out, but Nylander is definitively valued higher than Schwartz. Maybe not by all that much, but he is.
Parayko and Gardiner - Gardiner is an offensive defenseman that needs a good defensive conscience in order to be successful. He'll put up 40-45 points this year; Parayko will put up 35 (again). Parayko, however, is someone you can put out there in the last two minutes of a game to defend a lead. He's also played sheltered minutes under Piet.
This really works out to trading two first line wingers and two second pairing Ds. Nylander will outscore Schwartz over the next three years, and Gardiner will outscore Parayko. You can make the money work on both sides. Toronto needs more defense - which this gives; St. Louis needs more offense, which this gives. Maybe you throw in some draft picks to make it equal out, but I thought all along that this is close.