With Arch Manning behind him, Quinn Ewers boasts one of the best backups in the country. Nonetheless, ESPN’s Rece Davis is confident Ewers has no reason to worry about his job security. During an appearance on “The Pat McAfee Show,” Davis dove into Ewers’ status as Texas’ QB1. “I haven’t talked to [Texas head coach Steve Sarkisian] but, judging from last year and his trust in Quinn, I think the leash is really, really long for Quinn,” Davis said. “I don’t think he’ll need a lot of it because he’s a really good player who’s changed his approach to football and to his career and has been been mo…