Considering only 5 coaches have been with their current team longer than Stevens right now (technically Budenholzer, Clifford, and Rivers were all hired before Stevens, but all in the same off season and Brown was hired after Stevens but also that same offseason), I think it is pretty clear that the answer to this question is no.
what is odd is that there are no new coaches to start next season. First time I can remember that happening. Of course 12 coaches were hired in 2016 (Lue and Watson in the 16 season, the other 10 after it ended).