The concept of the power clean is to pull without the advantage of the drop/pull underneath. You really only want to drop to be consistent with the change in direction. Otherwise it screws up standard--full drop--technique. That said, moving feet wide isn't ideal for a power clean.
Most high level olympic lifts can clean more than they can jerk, so it allows them to be a less technical with arms. In general, your arms should be like ropes until the pull is Initiated. I pull to early sometimes and it reduces pull power, leaves bar out front, which makes clean tougher.