As of right now, I'm pretty sure Mason is under 40% from 2 in B12 play. Not so good when people don't foul him down there.
He's at 41.5% from 2 in Big 12 play. Morris is at 45.3%. A whopping 6 basket difference on identical 159 2pt attempts in Big 12 play.
http://www.sports-reference.com/cbb/players/frank-mason-1.html
http://www.sports-reference.com/cbb/players/monte-morris-1.html