I've had this happen to me. Had one last spot to fill, got the backup message from a kid. Invested about 10-12 scouting trips on him. Nothing. Put in another 5, saving just enough for a couple home visits and a promise. Still nothing. I put the rest into scouting trips for a total of about 20. Then sat and waited with no more money wondering why this kid didn't fall and if he eventually would.
Couple cycles later, I saw him considering another DII school. I was about to get ticked. Luckily, the coach was kind enough to tell me what he had done.... seems while I was putting in my 20 scouting trips over several cycles, he was all the way up to 30.