Why wouldn't they have used their strongest applicable patents? They may have more similar ones and maybe one or two will hold up but do you really think if they had some powerful non-FRAND ones they wouldn't have used them on Apple or Mircrosoft by now?

We didn't use nukes in Vietnam. The value of the Motorola's patents may be in keeping Apple and Microsoft from using their strongest patents.

I don't understand what the point of that would be. Patents only have a limited life and the stronger stronger and broader they are the more they strengthen you negotiating position. Of course there is uncertainty so you don't going in which will survive sufficiently but you don't deliberately pick anything but the best.

I just don't see the scenario were you can't do a licensing deal with your opponent but you agree to use you second rank patents in the lawsuit.