D-backfield play is a huge concern for a lot of CFL teams now - not enough good DBs?; or maybe weak defensive schemes that expose DBs a lot in coverage?

Pretty well zero worry for CFL defences now to get exploited by a consistent ground game. Why not have at least 6 pure DBs in the game most of the time - and a mix of zone & man coverages? Even a cover OLB (usually a converted DB anyways), lined-up close to the line and then turning his back to chase a receiver is IMO poor defensive scheme. Go with lots of pass rush (at least 5 on obvious passing downs - maybe 5 pure D-line types = 3 big bodies in the middle and 2 pass rush DE types); one LB only and 6 DBs behind them? = a fifty-one D look ? You could also blitz the LB or the extra free safety type. One of the athletic DEs could also drop in coverage at times and playing games with 2 safeties who give different looks could confuse QB reads who like to see where the one safety is lined-up.

Scape-goating a DB who gets burned in one game and cutting him is IMO mostly B$. Cutting dumb, myopic defensive coaches might make more sense.