The hunt for another top-winger may be due to concerns with new acquisition Tyler Bertuzzi. He's dealing with a minor injury, but has had a slow start to the year, especially for someone playing in the top line.
The biggest issue for the Leafs in attempting to add someone new is, of course, cap space. More specifically, the lack of it. Toronto currently has just over $100,000 in cap space, far less than what is needed to add a player making the league minimum.