Here's where you meet reality.
BB-literally everyone, including Brad himself, have always said he wasn't ready to start, did not know anywhere close to the whole offense (when in he ran a limited number of plays that highlighted his mobility). No one has ever said otherwise, except semi-informed fans that are not Hall of Fame coaches. This story is completely fabricated.
Jake C-started two games before the switch was made. Moreover, if you look at the two games Jake outplayed Ricky. You think maybe the coaches wanted to see if Ricky could keep the Wild Thing under control before he got the complete keys to the car? The people who have to make real world decisions need to consider things like that before they make a QB change, and they do not have the luxury of hindsight. Since Ricky threw either 14 or 16 picks that season alone, he remained kind of a Wild Thing. Since they split time in the first two games, and Ricky started the last ten this tale is grossly disingenuous, naive and misleading.
Now go journey down CJ/Rudock's season game by game. Rudock significantly outplayed CJ for the entire season-but CJ kept improving and provided the greater upside so once that was established the coaches changed starters. CJ's improvement was not certain at the outset of the year. CJ had some really bad games the year of the rivalry. CJ got the job and they both played in the NFL-meaning Jake Rudock was a very good quarterback. Jake surpassed CJ in every statistical category, including wins during their season together.
All three of your "examples", even the factually accurate parts, do not offer any kind of a real-world indictment of the coaches' ability to recognize the best QB on the roster.