There is no such thing in sports as a sure thing. As an organization, the Vancouver Canucks try to leave nothing to chance. The National Hockey League team assesses, monitors and micro-manages every aspect of their players' preparation and performance. Nothing on the Canucks happens by accident. But try as progressive general manager Mike Gillis does to out-plan and out-think everyone in order to reduce uncertainty and risk, his biggest decisions — like Saturday's shock trade — are fundamentally fraught with them. The David Booth deal is no slam-dunk. Sorry, but almost no trades are.