"Interest" usually means contact with coaches, whether face-to-face, phone, texting, etc.
Generally a recruit receives interest from coaches for a few months before being offered a scholarship, as they build a relationship and the coaches guage the recruit's personality and attitude to see if they'll be a good fit on the team.
Early commitments at the MAC level usually have interest from schools, but few scholarship offers because most schools haven't gotten to the level where they're ready to make an offer. Maybe he would see more offers if he stayed uncommitted longer, but maybe not. It's a gamble to wait, and if a school feels right then it's not uncommon for the recruit to commit and get it out of the way early to focus on their senior season.