Ultimately every draft selection is the responsibility of Steve Keim; he gets the acclaim or the blame.
This idea of the Cardinals following PFF recommendations is farcical! As WC stated the Cardinals have an entire scouting staff, they are the one's making the evaluations and analysis. As GM, Keim has too much on his plate to review every prospect in detail; but he IS responsible for the end results. As I detailed in another thread on this topic, there are a number (4 or 5) of persons on the Cardinals scouting staff with ties to UMASS. Think a few of them might have overrated Isabella? They are the one's whose voices Steve Keim had in his ear, not PFF, not KK.
The blame is Keim's. Maybe Keim should be fired; maybe some or all of the scouting personnel need let go; or possibly both. But generally that is not the way the Cardinals; i.e. - the Bidwill's; operate. Most of us know they value loyalty highly, so more likely Keim will eventually be out, but the people making the evaluations/analysis will still be in place.
This is the Cardinals. . .