I finished the book today, and while it was good, aside from the Deltan/Orion parts, it also seemed to be missing a scene.
Reading up to page 278, when the explosion at Skon and T'Rama's house occurs, and T'Pau leaves the Vulcan council inquiry, T'Pau is still First Minister of Vulcan; however whe she's seen again at Skon and T'Rama's house, she is described as "Former First Minister", and at various points afterwards it seemed that she was still First Minister, but then there were other parts where (and in one scene Kuvak was identified as being First Minister) she seemed to be "Former First Minister". I've gone back to see if there was any mention of T'Pau stepping down as First Minister, but I can't seem to find the scene where she steps down. Was this possible deleted by accident during a revision?