I'm surprised it was still the case last year. I knew he was for a while, but would've thought someone else had displaced him the past few years.
That much for an assistant is a LOT of money. If you check the link I posted for last year, Locksley is #29 on the list at ~$625,000. Everyone outside of the top-five was closer to Mike than to #1.
This year saw a bunch of big assistant hiring like Muschamp.