You're talking about a pack vs an individual. Different story, and works the other way too, i.e., a single wild wolf would be dog food for one of these catch dog teams.
What? You think that maybe single wolves are vegetarians?
At any give time there are probably between 10 and 20 percent of a population that do not belong to a pack. They still gotta eat and they still kill and eat whatever is handy without a lot of regard to what it is.
Further, when I follow wolf tracks of a hunting pack what I see is they can often be very widely spaced. A quarter mile or more is not unusual. More common is less, and I do not often see more than two in close proximity except on kills. That indicates to me that they will engage large prey as individuals. Being as lone wolves don't seem to starve to death, I have assume that they are successful taking down large prey as individuals.
They may well do better as a unit against huge prey like moose and bison, but I believe thy do all right as individuals too.
