I think the stepping in the footprints of the lead wolf part of it was not for stealth or to trick anybody, but the wise conservation of
energy when moving in snow. This may have tricked people who did not know how many wolves were there, but I think the primary purpose on the part of the wolves is to conserve energy. If every wolf in a pack was to plow it's own way through the snow, the caloric reserves of the pack would quickly be exhausted.
I think wolves are smart, but their intelligence is channeled into several avenues based on their species specific needs.
Some wolves, like with people, are smarter than others. Some are very difficult to trap or hunt, because they are super crafty at figuring things out, whereas others are easier to catch. I don't trap myself, but know people who do trap and hunt. A wolf or wolf pack can judge distance that a rifle can shoot, and subsequently stay just out of range of a hunter who is working on a hunted elk, moose, deer, or whatever.
A wolf pack will use a lead animal to run fast after it's selected prey, while the rest trot steadily but more slowly behind, conserving energy. They take turns to run fast, driving the prey to exhaustion and to the point of making mistakes, while the previous charger goes to the rear to regain energy.
A wolf understands the facial expressions and body language of other wolves, communicating a wide variety of needs/demands/.
A good book to understand wolves a bit, and is very entertaining winter read: In Praise of Wolves by R.D. Lawrence.
The author was a Canadian Government Biologist studied wolves for a time. He also raised wolf pups in a way that was wild enough to set them free; the big male nearly killed him. Fascinating.