dahs, I went back and looked at the ticket and it turns out they wrote that they are 'essentially' averaged, not actually averaged. So apparently I misunderstood them and thought it was indeed being averaged.
and girt I understand and agree with everything you said, it's just that I hate the expression 'hide a weak' defender, since they are still hurting your team defense. The opposite of what you said also works, though, where you can take a weak defender and move him around if you think another coach will try to attack him, whereas you can't in a zone.