As I read it, and I also could be wrong, T-Mobiles initial posturing was all about ownership of the patent. That is what forced Diac and Williamson to join the case; there was a legitimate question of whether all the real parties in interest had joined the case. Without them, the case was not ripe to proceed.
If the stipulation provided for complete "ownership" of the federal case then I see no reason for the attorneys drafting the stay to mention the state court case. It would be irrelevant. Since they did, I must believe that it has relevance to the federal court case. That is pretty much all I am saying.
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