The Goodman & Co early warning report could also be a requirement for the TSX listing to navigate around the PIF requirements or something else of that nature. I don't think it has anything to do with a takeover but major decisions need to go through due process which includes regulatory approval and voting of major shareholders >10%
"(b) if >10% shareholder is widely held fund, provide information or brochures on fund and may be exempt from PIF filing"
http://www.mcmillan.ca/Upload/Publication/TSXListingRequirements_1108.pdf