I refreshed my memory vIa Wiki. I guess the reference is to the fact, Carmody was DC at State in 89-90. Left when Sherrill was hired, and was hired by OM as an assistant.
So I guess the reference is Carmody was to Sherrill as Arnett may be to Lebby???
However very similar to 91, Sherrill staff was totally different and I'm not sure what Carmody had to offer as far as intel. Fast forward to today, with the transfer portal, a totally new staff and offense, I'm not sure if anything Arnett can contribute (regarding MSU) to OM as an off the field analyst.