Cris might have been awarded the starting position because he has the most game experienced, has the backing of his teammates and adapted to the way Ash wants RU to play more than the other returning QBs did.
Rescigno was Starting QB Freshman year, and was behind Five star Shane Morris (Michigan commit)his sophomore thru Junior years, and played WR. He came in his junior year, when Morris was diagnosed with Mono...Rescigno's senior year was what earned him his offer from Rutgers. Be prepared for this Dark Horse to run hard!
Allen might be a little rusty in his reading defenses along with his passing game and needs more time learning Ash's system.
Don't know if that's the case, but obviously Ash felt more comfortable naming Chris the starter rather than name Zach #1
Gio was supposed to need time to develop when he committed, remember even thought he was the starting QB his senior year in HS, Rescigno was a WRer his freshman and sophomore years moving to QB his junior year.
He might have the talent to be the starter, but needs more time to learn how to use that talent to overcome what Laviano is showing Ash.
This is the second year Rettig hasn't been able to pull ahead of Chris, we can blame Flood for not giving him a proper chance when Laviano was showing nothing last season, but something has caused Hayden to fall in back of Chris in Ash's eyes or he'd have been named the starter.
As for TO,probably Ash doesn't want Tyler to start and take the pounding the starting RU QB will probably be taking , until Parker builds Oden's body up from what it is now.
So S&C is what is most important for Tyler Oden right now and being in the starter's hunt isn't what Ash has in mind for him until he gains more strength and weight.
That's my uninformed opinion on how the race for #1 QB spot panned out