Polk vs Brown

The Eagles selected Bryce Brown RB from Kansas State a former #1 recruit in high school. They then signed undrafted FA Chris Polk RB from Washington who a lot of people had going in the high rounds. They will battle for the 3rd...or Second RB spot behind McCoy and possibly Dion Lewis. My take is if Bryce Brown wins the job then he will be the third I just think with his lack of playing football because of all the college changes that it will affect him in the long run and just dont see him more valuable then Lewis. Polk if make the roster and stays healthy should be a defenite #2 the reason for him being undrafted was because of his Shoulder Injury he had before the draft. I dont really like Brown but love Polk he could be a huge piece of the running game if he can beat out Brown.....and Greg Cooper.