I think I do, because I think it means getting an ace around July 29th. An ace that will help in the playoffs. As odd as it sounds, the Cubs have the luxury of waiting; the only thing at stake is a first-round bye. If you add a TOR starter instead of a MOR starter by risking that bye (not losing, mind you, simply risking) I think you do it. Get Assad and Shota back, move Brown to the pen and Horton to AAA then. Then Rea to the pen when you land that TOR starter.
Of course if you can make the right deal sooner, do it.
So I would not say as you did, "the sooner...the better." I would say, "the better, the better."