TORONTO — Sidney Crosby is capable of a lot. The Penguins are asking a whole lot of him. That was evident in a 4-1 loss to the Toronto Maple Leafs at Air Canada Centre on Saturday night. The Penguins have lost three in a row. Crosby, the NHL scoring leader with 18 points, has failed to produce a point in two of those defeats, and the Penguins have scored just once in those contests.