DJ played 208 snaps in the 4-3 as a mike backer in 2008.
He had a +1.8 rating and more importantly, 11 defensive stops, which is a very good stops-to-snaps ratio.
I have a hunch we're going 4-3. DJ will be just fine in this role.
Alex Smith's career record when the opponent scores at least 24 points: 2-30-1