If I'm reading and comprehending your initial post correctly, that Texas HAD a coach during the job process portion of the season (thus not allowing any other coach in that world the opportunity to apply for the job due to it already having a coach), that the coach was there DURING recruiting, but disappeared AFTER recruiting, thus resulting in Texas becoming a Sim team, then yes, I think in this one specific scenario the job should have stayed open all season and been available during the NEXT job process period for everyone to apply. But only if I'm understanding correctly that the coach disappeared DURING the season.
Under normal circumstances, should a coach returning to a world be allowed to reserve a BCS team? Abso-frickin-lutely. Why? Because that team had been available to anyone who qualified during the previous year's job application process and NO ONE TOOK IT. After that, when the season started and that team was Sim coached, I have no problem whatsoever, none, if a coach decides that he wants to rejoin a world, looks at the list of available teams that he qualifies for, sees that one happens to be a BCS team, and then reserves the team. His resume was obviously good enough for him to qualify for the job, no one else wanted it during the past application period, so it's his. Period. Boo-frickin-hoo if someone cries because he was able to reserve the team. He was qualified for it, everyone in that world who was qualified for it during the last job application period passed on it (which incidentally would have taken place BEFORE he reserved the team), so where's the problem? That someone who had a great season DURING the year he reserved the team can now no longer apply for the job? Waaaah, should have been better a year earlier. There have been several times where I have missed out on jobs because someone got the school one year before my big breakout season. You know what? I should have done better sooner! He did, so why punish him?
Again, if I'm understanding your initial post correctly, then I think that coach should have had to apply like everyone else. But that is a very rare and strange scenario that you described. Under normal circumstances, I have no problem at all with a coach being able to reserve a BCS team, a mid-major, a D2 team, or that world's worst D3 team if they so choose. They were all available to anyone who qualified, no one took the school, so it becomes fair game for any coach returning to the world that qualifies for that team. In the Texas situation, he should have to compete against other coaches who also qualify. But normally, no sympathy from me for anyone who whines.