I know Bettcher is regarded as a terrible DC by most Giants and virtually everyone was happy to see him leave. What I had forgotten was that Spagnola was fired by Shurmur when he hired Bettcher. Read that Spags had hired Shurmur as OC when Spags became a HC. The only explanation for letting a quality DC go for a less than quality DC is the style of defense the HC wanted to run, maybe a 3-4 instead of the 4-3. But, I have no recollection of what happened.
Truthfully, this has nothing to do with Wink. But, another example of how the Giants let go of an outstanding coordinator. And, for Bettcher?