Disagree... assts. that are fired are usually let go at end of season...ones that are moving on, usually are close to, or after signing day
The last 2 years NU has fired an assistant the day after regular season ended(DLine coach last year, special teams coach last Saturday). The coaches that took upgrade in jobs left after signing day or everybody knew they were going to leave because of a new hire where the assistant had a long history with a new or changing head coach. Any coaches that were to be fired would be done for the short recruiting period that schools are currently in. It's all hands on deck for the next 2 weeks. Can't have a lame duck coach that the head man knows he is firing out recruiting.