Colin Hitschler is a interesting name I don't believe theres much connection between him and Key. He's had Co DC roles for awhile and apparently was primarily in charge of Safeties this past season in Alabama and Alabama finished 9th in the country in Total Defense and 19th in passing defense and his safeties have 8 takeaways for year. He seems like he got good pedigree and experience never been a full time guy so that's interesting but also he's got a rep with being a good DB side guy and we have alot of studs in the secondary so there some synergy there.
His firing from Alabama sounds more like a scapegoating/not my guy firing.