An intriguing scenario could unfold in which the Vancouver Canucks end up with Gavin McKenna on their lap.As it stands, the consensus is that the Toronto Maple Leafs will pick the Penn State standout with the first-overall pick. That leaves the San Jose Sharks, barring a trade, to likely take Ivar Stenberg with the second selection.With that scenario playing out, the Canucks would have their shot at #3 to take the best center in the draft, Caleb…