they've been venturing into power lifting and dave tate for a loooong time. They like to reach out and grab the best parts of everything.
Dave is obviously an authority on power lifting and hence is a good person to reach out to. Mark does olympic lifts. both compliment each other, but are not always the same, but like I said can work together.
Comparing powerlifting and olympic lifting is a bit like comparing apples to oranges and as CF says their specialty is not specializing... constant and varied etc, etc.