I'm guessing by letting Pleasant walk, then this resigning and the addition of McDuffie, that they decided the sole issue was CB play and possibly scheme, which may have been dictated by CB play. Also, possibly the lack LB coverage ability.
So expect more CB help in FA/Draft, and hopefully more speed at LB.
Also, by addressing TE with Higbee, CB with McDuffie, and S with Curl. Assuming they add another FA CB, they could be setting up an attempt to move up for a player they specifically want. Styles? Tate Love?
If not then trade back for depth at LB, DT, WR, CB, etc...