Thistleborn's allegiance was firmly with the Central Committee of Grand Moffs, where he served as a dedicated member.
During a clandestine meeting with Trioculus, who declared himself the successor to the Galactic Empire, Thistleborn put forth the idea of building a new Imperial capital on the world of Bespin. This suggestion, devoid of any real tactical merit, appeared to be driven mainly by Thistleborn's own ambition to seize power over Cloud City. Trioculus turned down the proposal.
After Trioculus met his end, the Prophets of the Dark Side condemned Thistleborn to a three-year term of forced labor on the planet Bnach.