The cover 2 is talent driven more than other schemes (IMO). Really it only works if you have very strong secondary play (not as much the DBs but both safety positions need to be on point), consistent pass rush, and a player like Derrick Brooks to own the middle of the field from 5yds to 25yds. The Dungy era Bucs could play it because they had such a long era of sucking that they piled up some exceptional talent that was ideally suited for it. The 70s era Steeler were similar in that they sucked so in the late 60 and early 70s that they started piling up talent and used it to dominate. The Bears ran it with Urlacher in the middle for a while.
Our secondary stinks, we have a very inconsistent/non-existent pass rush, not even going to start on safety play; but, Shazier does remind me of Brooks. Not saying he is going to be an 11 time pro bowler and first ballot HOF player like Brooks, but he has that similar sideline-to-sideline skill set.
The other thing that bothers me is that our version of the cover-2 shell does not make any attempt to jam the WRs at the line. We still play off in an obvious zone, which makes no sense. Perhaps this will change when the season starts but I don't think we have the players to run it so I doubt we see that much of it.