As someone who reads a lot of their stuff, take anything Metrolinx say with a large pinch of salt or at least look for corroborating studies. These are the guys who stood over a study of 10-12 car EMU trains to replace loco+9/11 duplex trailers+duplex DVT by using conjugated 3-4 car EuroEMUs (Coradia) as a comparator rather than the more similar train consists operated in places like Chicago. (see
p29 of this PDF)