I guess it boils down to do you believe everything you hear? Your list is confusing because is just getting into the UFC meteoric?
A few of those guys were untested really or at the least you could call them green wile others like big Tim there is less wiggle room still he had a good run and now that more athletic big guys are fighting his run is over but at the time Tim looked invincible but again that has alot to do with the level of competition as well.
Most of the fighters listed had a rocky road and never looked unstoppable in the UFC, CC did he best in pride and in a ring but age plays a factor too.
Speaking specifically about the "fall" most fighters get a few chances at redemption. Who thinks Machida has fallen? Only a fool would fire him for losing to top 5 fighters and Dana wont cut him any time soon.
IDK a lot of the fighters dont seem to fit the thread, Vera dose but IMO most dont.