Welcome to UCF Knights on SI's countdown to kickoff! So, with 28 days to go, let's meet UCF defensive back Matt Irwin:1. Who is Matt Irwin? In fact, he is the only Idahoan on the Knights' roster this season. Irwin played in all 12 of the Vandals' games last season, and started in three of them. Irwin is one of three additions from the transfer portal to what was already a deep UCF defensive back room.