FWIW's one thing I want to reiterate is that sometimes you have to get lucky when it comes to assistant coaches as well....Remember when Mike Martz wanted Larry Marmie as his DC after his first year as Head Coach, but the Cardinals denied him permission so ended up hiring Lovie Smith instead.
Sean McVay also was very fortunate because he wanted to find another Bill Callahan, who coached the Offensive Line in Washington, so McVay and the Rams asked the Miami Dolphins permission to interview their OL Coach Chris Foerster (yes the same guy snorting a substance) for the Ram Offensive Coordinator position. I have a feeling Foerster would have been OC/OL Coach, however, the Dolphins denied permission and that led to the Rams interviewing Aaron Kromer as OL Coach and with Matt LaFleur now in Tennessee, Kromer now is running game coordinator/Offensive Line Coach...Again along the way to success, you need a few breaks too and in this case, McVay got it.
