Ok, so the DRL will obviously relieve the Yonge line, but if it's built from, for example, Pape to Union, a person who lives at STC will have quite a few transfers. Say the person who lives at STC works at King & Bay. he would have to transfer from the RT to the Bloor Subway, then to the DRL at Pape, then to the Yonge line at Union, an then he would get of at King, and walk a block to Bay. Wouldn't it be easier for this person to just stay on the Bloor train and have just 2 transfers total. If the DRL went along Queen, that would still need a transfer in winter, because of the weather. So, what I'm basically saying is that the DRL would only remove riders going to Union, or in the close proximity, riders along the route, and I guess riders not coming from Scarborough but rather from the B-D line, and of those only those working close to Union.
Hope that was clear enough, I'm just questioning what kind of alignment would best serve as relief.