I think some confusion comes from the fact that the bearhug is being discussed like a punch. "Defense Against The Punch"...well what *kind* of punch. A jab, a hook, a straight punch, a hammer first, a...
A bearhug where someone grabs and holds you is a different attack than a bearhug that goes right into a throw is different then someone grabbing you.
The first (physical) line of defense is "don't let the person get your back", second line is "don't let them get a grip". If they get to that point then whether they hold, grab, or throw, it's now in a different area. A grab you can break, a drag you can break, a throw, well..at somepoint you may be just along for the ride. Like a hip throw, like a takedown, even like a punch, there may come a time in the attack where your defense has already failed at an earlier point and the best you can do is wince, try to survive the attack, and move on to your next move
I think Brad's only point is that on the "bearhug-and-throw" by the time you are in the grab it may already be too late and you're only hope is to survive the throw and move on. I think many other people are making the point that this is not the *only* kind of bearhug attack, and that it's possible to defend before you get to that point as well,but there seems to be a bit of ambiguity in what is really meant by a 'bearhug' that is causing a bit of confusion