For all you legal eagles out there:
https://www.patentspostgrant.com/ptab-estoppel-sword-shield/

Since SFOR's patents were upheld by the PTAB --- shouldn't estoppel have come into effect:

Quote:

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Estoppel meaning in law
The legal principal of estoppel keeps a party from alleging a fact or acting in a certain way, then attempting to claim something in opposition to that fact or action later in the proceeding to suit their purposes. In other words, a party cannot deny a fact that has already been settled as truth. The truth may have been determined by a judicial decision, legislative act, or by the party’s own acts, deeds, or representations. To explore this concept, consider the following estoppel definition.

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I guess I'm just confused how the Alice 101 argument was allowed in the 1st place. Our legal system seems to have a lot of holes in it.