CK picks Matt Barkley?

I couldn't help but wonder, why did Chip Kelly pick Matt Barkley in the fourth round of the 2013 NFL draft?  I thought it was a foregone conclusion that CK would try to find the most mobile QB, not the traditional west-coast pocket passer.  Not to mention, he's already got three mobile QBs in Dennis Dixon, Nick Foles (wow, three PAC-12 quarterbacks on the same roster?) and Michael Vick.  Surely, he's got his eyes set on 2014 draft and Marcus Mariota, no?

Barkley Against Oregon:

• 2009  187 YD / 2 TD / 1 INT / 108.7 rating
• 2010  264 YD / 1 TD / 2 INT / 96.9 rating
• 2011  323 YD / 4 TD / 1 INT / 189.2 rating
• 2012  484 YD / 5 TD / 2 INT / 163.3 rating

No way would the Eagles carry five (Barkley, Dixon, Foles, Kinne, Vick) quarterbacks on their active roster; at least two of them will be dropped / placed on the practice squad. I don't really see Barkley fitting into a team running the spread, except as a practice squad QB, but then that would be a waste of his talent.  Either he gets traded away during the Summer, or gets dropped during preseason, then picked up as a free agent...say Oakland, Arizona or San Diego?