Neither Vick or Foles won the job last year
Looking at the basic picture, it's clear that Vick is on the decline of his career. He's 33 years old and has significantly regressed since he was an MVP candidate in 2010.
Kelly Brought In Matt Barkley
Kelly has no loyalty to anybody on the current Eagles roster, including Vick and Foles. I'm sure he feels a little bit of loyalty to players he coached in college or players he drafted.
He can work with Barkley's mechanics any way he wants, and he's the first coach who's done so.
This is a player who fell to the fourth round just a year after he was rumored to be a top-five pick, possibly higher, in the entire draft. So which quarterback is he? Is he a mid-round prospect who's due for a career of mediocrity? Or could he turn into one of the game's brightest signal-callers with proper coaching and a talented supporting cast?
Not Winning a Super Bowl This Year
If the goal for the Eagles was to win the Super Bowl this season, Michael Vick would probably be the quarterback I'd pick. I'd still be worried that things would blow up in my face, like it did in 2011 and 2012, but if Vick was anything close to the electric weapon from 2010, the Eagles would have a real chance at making a run.
How Successful Other Rookie QB’s Have Been
Rookie quarterbacks are immediately thrown into the fire nowadays, and what's even more impressive, they've been succeeding.