 Why is Crownwall the representative from Earth sent to Vega?
The sight of an Earthman on Vega III, where it was impossible for an outlander to be, brought angry crowds to surround John Crownwall as he strode toward the palace of Viceroy Tronn Ffallk, ruler of Sector XII of the Universal Holy Empire of Sunda. If they carried out the threats of their present attitude, Earth would have to send Marshall to replace him. A pair of guards, their purple hides smoothly polished and gleaming with oil, crossed their ceremonial pikes in front of him as he approached the entrance. "Just tell him that a man has arrived from Earth to talk to him. His Effulgence commands you to appear before him at once." Behind him stood a heavy and pompous appearing Vegan in lordly trappings. "It was only decided yesterday, back on Earth, that I would be the one to make the trip here. What I meant was that I expected someone from Earth to break through our blockade and come here. "If you wanted someone from Earth to come here to see you, why did you put the cordon around Earth? And why did you drop a planet-buster in the Pacific Ocean, and tell us that it was triggered to go off if we tried to use the distorter drive? When you showed up in the spaceways, it was decreed that you had to be stopped at once.
 He was a reasonable option given his prior leadership experience on missions
 He was the only one who was willing to undergo the time travel procedure  He was the only one without connections on Earth, making it easier for him to take time away  He was the default choice once the humans determined that Marshall was not fit for the job  He was a reasonable option given his prior leadership experience on missions