Krumrie's a technique guy, not an X's & O's guy, we'd say herm absolutely was telling them where to line up in that they had a 4-3 gap stuffing role to free up Herm's pet secondary to create the "wonderous cover 2" blanket of coverage.
Unfortunately, the premise of the cover 2 is that your front 4 can consistently generate a pass rush: Tampa under Dungy and then Indy. Now back that up with soft LB core who isn't causing ANY havoc with blitzes, save Herm's pet "safety blitzes" and you have recipe for disaster no matter how good the personnel or the technique.
You funnel all your resources, planning, and priority into your secondary the rest of the defense suffers. Gun as well as Krumrie didn't ever appear to particularly "cerebral" and they made their hay under Marty and a "smash mouth" "attitude" type defense. The key was "havoc" and intimidation.
The Cover 2 implemented in a system without an established front four turns your every down defense into essentially a prevent defense, which we all know "prevents you from winning." Also, we find it tough to believe that our rookie corners would be as "impressive" in any other system that forced them to shoulder more one on one coverage.
Simply stated, you can't have what amounts to a 4 on 6/7 every down with soft a LB core and expect anything less than what we got last season.