Its highly unlikely Frank would've gone small, I don't think it fits his system. He would've played Gip, JO, and Diaz along with one of those bigs he was recruiting before he left. Shane would've been relegated to backing up Rod last year and occasionally playing the 2.
Nobody is saying oscar is a genius for going small, but he has to get some credit for making it work, especially on defense and rebounding at a pretty good level.