Maple Leafs Surprise Fans by Omitting McKenna from Power-Play Unit

TORONTO — The Toronto Maple Leafs unveiled their first crack at a loaded top power-play unit, and Jack Roslovic is on it. Which means strong PP1 candidates Matthew Knies and Gavin McKenna find themselves starting with the second group. Surprise. McKenna, 18, is only making his pro exhibition debut Saturday versus the Montreal Canadiens in split-squad action, and the organization is hesitant to heap too much on the rookie’s plate out of the gate. As for the 227-pound Knies, a net-front beast, well, he simply curves his blade the wrong way. So, Hiller has dropped righty Roslovic down low, lefty…