From 2010 to 2011, Alex Smith gained one receiver, Braylon Edwards . The 49ers backfield gained rookie Kendall Hunter , and the defense acquired rookie linebacker Aldon Smith . There have been some other changes to the 49er roster, but can these fairly insignificant pickups really account for a 9-1 record in week 10, after going 6-10 last year and missing the playoffs in the lowly NFC West? The real change, although it is hard to prove, is coach Jim Harbaugh . Initially, I will note, that other than play calling and technique, I find very little sympathy for people who argue that coaches really make a significant difference in the NFL. And I know that I'll get shit for saying that, but let it go for the time being. After all, one can hardly call Harbaugh a revolutionary college coach, after he basically one the lottery with Andrew Luck and Toby Gerhart leading the Cardinal offense. So for now, imagine Jim Harbaugh has not really accomplished anything. So what makes him such a