I agree with the gist of your post. The more I have thought about it, however, the more I lean toward believing that the "mandate" may have been from the insurance company covering the litigation. Maybe there was a statute of limitations or time period in which litigation had to be completed or coverage lapsed. Depending on when the start date would have been triggered, a ten year limit of some type could have been approaching.
On another topic, I wonder if you (or others) have calculated the maximum time (assuming the language is the same in the NOK/Samsung contracts as it is in the ERICY agreement) before arbitration HAS to kick in. Some of the language is subject to interpretation, and I have concluded it could be as early as mid June or as late as the end of September.