After following recruiting for several years, I think this would set the record.... potential to offer a 4* athlete out of nowhere two days before signing day and get him on the dotted line. That'd be something.
Correct me if I'm wrong, but he can wait to sign until after he's visited. The way I understand NSD is that it's the first day you can sign with a school. I don't think it's a requirement to sign on NSD.