If our top 4 WR's are: Diggs, Boutte, Pop, Hollins.
Then it makes sense to take a swing on either Polk or Baker rather than Bourne - only because they're in the same bucket, as far as size and type of routes and skill a this point... that is - IF both can get their head game figured out in time.
That's the one thing Bourne does bring - a very good attitude and he knows where to be in the scheme. He's still reasonably productive.
But I don't think we should keep both Polk & Baker. Roll with whomever is consistently excelling and doesn't make mental errors in the preseason. Then take Chism as the 6th or 7th.
Hollins needs to blast off in production and physical traits in order to take Bourne's spot on the roster. Cause if it's a toss up, I'd keep Bourne.