ALDON SMITH is closing fast on Michael Strahan's single-season sack record of 22.5. He has already reached 30 sacks faster than any other player (27 games), so it's safe to call the Niners outside linebacker the best defensive player of 2012, right? Not so fast. We rounded up four expert opinions on the 6'4", 258-pound Smith. The verdicts varied as much as San Fran's vaunted D-line stunts.