It depends on exactly which part of the great white north you live but the norm* is that as the photographer you own the copyright on the images, unless you sign an agreement that assigns the copyright to someone else. As such you are the one who decides what can and can't be done with the photos and if you intend/hope to sell them for "commercial use" (advertising/websites etc) then yes, you need a model release form. You should also have an acceptable usage agreement, or an acceptable usage clause in the TF agreement, which clearly states what the MUA and the models may/may not do with the images (use in portfolio OK, use on FB OK, selling images not OK, entering them in photographic competitions not OK.... etc).
Well, he still needs a model release to use the images regardless who owns the copyright, but the owner of the copyright can stipulate the range of uses his release can authorize.
There may be many licensed users of an image, but each licensed user needs a model release for his particular commercial use, or a copy or reliable knowledge of a release that legally covers his particular commercial use. My model releases, for instance, don't cover anybody else or anyone else's uses but my own.