No, more to do with being unificationists, while Norris was a separatist. Norris was a close personal friend of one of the PC's (Homeworld= Regina, Service=Noble, Starting rank=Baron, ending rank=Duke), said duke having been "Court Duke of Regina", the duke assigned to run Regina SS for Norris when he stepped up to being the Archduke. It was a political game from hell...
The PC's were made aware, as background, of Dulinor's reforms, and Norris' parallel reforms in Deneb, as well, and also the players knowing about the right of assassination. One quick encounter with Lucan was all it took; they were sent as part of the Marches delegation to the moot, and holding proxies for half the imperial dukes of the Marches. Upon finding the Vilani separation, Lucan's insanity, and other factors, their choices were Norris' separationism AND democratism, he was not a viable long-term choice.
That leaves Dulinor, Margaret, Craig, Warnier, "The Real Strephon," and Brzk. Brzk was unacceptable, not due to speciesism, but to flakiness. Craig and Warnier likewise to Norris are separatist. Margaret is out based upon her ties to SSOM (another PC was cybered, lightly, but cybered). The "Real Strephon" lacked credibility, in part due to not being willing to attend the moot; they later executed him for treason against emperor Dulinor.