Why not have 100 posts on how bad Ebner is as a safety? Richards is another STer that Belichick views as BETTER than Ebner.
Yes, I would like to see a backup SS on the team. And maybe one of the corners (or even a LB) is that player; or not. The situation just might be that Belichick views the #4 safety as a ST roster spot, and the fact the players needs to play a few reps a year on defense is not as important as the contributions on special teams.
We whine over the lack of production on the 20 defensive reps of [Ebner, Richards and King]. Most would accept much less production on special teams many times a game for the improvement in the few defensive reps.
As an aside, in 2017, Richards was considered by Belichick to be a better option at SS than guys like Ebner, and better than the corners and linebackers. Perhaps the situation is different this year, perhaps not.
OPEN QUESTION
Is the improvement at SS for a few snaps a year worth losing a regular special teamer? Many (most?) here want to get rid of the STO players. Belichick chooses (over and over again) to put a higher priority on special teams. Many here believe than almost any scrub that has played ST in college is OK as a replacement to guys like Ebner, Richards and King. Every year, Belichick disagrees.