What is the benefit of cutting Baker to add worse players on an already bad defense?
Obvious. You replace an 8 rated safety with a 6 rated safety for a 3rd of the money.
You take that money and replace your 4 rated lineman and your 4 rated cornerback with 6's and 7's.
Collectively boosting your overall talent in those positions from 16 total to 19 total.
Except of course not all positions are of equal value, so you barely notice the drop off from 8 to 6 at safety. But you notice greatly the improvement at DL and CB from 4 to 6 and 7.