D2 and JUCO programs are full of former D1 players, who probably should have started there in the first place. I left out D3 because usually, those recruits have specific career goals and are high achieving students.
I don't think you have to leave D3 out. Many of the top D3 teams rely on a steady stream of D1 drop-downs. The D3 World Series usually only has one or two HA schools.