*Looks up the meaning of Cronyism and Nepotism*
Hmm...
Chrono got to be Admiral due to this, huh?
What about Hayate being a Colonel by age 19?
Or Nanoha the top combat instructor by age 19?
Given that light, it's very unlikely that Chrono had special treatment. (Doubly so since he supported Hayate, and it's revealed that in the 3rd season that Hayate's still disliked by people in the TSAB due to the Wolkenritter's past actions and how she took responsibility for it.) He'd probably turn it down. Hell, he got upset when his mother tried to act like his mother during missions.
Riot Force Six disbanded for 2 reasons: The Lost Logia that they were meant to secure (relics) and a year had passed.
Besides, it was an experiment to see if a smaller group would be more effective than a larger group.
Planet not in danger if the TSAB had not been corrupt, huh?
Hmm... I can both agree and disagree with it.
Agree because then Jail wouldn't have been made.
Disagree because there's still the off chance that someone would have done what Jail did anyway.
Besides, Jail making artificial mages and combat cyborgs was done on orders from the various forces within the TSAB to help bolster their forces. Don't forget that he originally started Project F which Precia managed to perfect. Which screams to me that someone would have done what he did eventually.
Besides, the making of Riot Force Six had the backing of at least six prominent figures in the TSAB (Carim, Lindy, Chrono, the 3 Admirals). Add in Nanoha's celebrity status and it was practically guaranteed.
While the TSAB publicly dislikes and tries to shoot down the creation of Artificial Mages, Clones and Combat Cyborgs, they only really get upset when it goes wrong (you're experimenting on human lives, you asses). Because if it is done right, well... Then there's more combat-capable mages to help deal with problems that run around.
Plus, let's face it, most normal human mages can't break the B-rank in power or ability without special circumstances. Hayate was given the Tome of the Night Sky. Verossa and Carim both inherited rare skills from Ancient Belka, which seems to be their only real power. Every Artificial Mage, Clone and Cyborg has been (by the end of StrikerS) at least AA-rank in overall magical ability.