McCann is 29, not exactly old. Peavy is on a 1 year deal (with an option that only vests if he plays well). Not exactly committing yourself to a bunch of grey hairs. I understand why you wouldn't want the Jays taking a bunch of long term deals though.
Rasmus really wouldn't be fighting for a spot, Melky probably either. It was more just to throw out the names of theoretical fielders to see them on paper. Sometimes I make a fantasy trade and then go wait a minute Gose, Melky, Rasmus would be a terrible OF (which it would haha).