I initially posted this in another thread, but in the hopes of reaching a great number of Bell-doubters, I'll repost here.
As someone who was a two-year starter at left tackle in high school and was recruited to play offensive tackle at several FCS schools, I can tell you that playing left tackle is completely different from playing right tackle.
During the second half of my sophomore year, I made the position switch from tight end to right tackle and struggled in pass protection. I was beat inside more often than out and my coaches attributed this to lack of strength and dexterity of my left hand/arm.
The following summer, due to the graduation of the starting left tackle, I switched to the left side and in my first season at the position, I was an All-Conference and All-County tackle. During the recruiting process, most schools wanted me to play defensive end, but those who recruited me as an offensive lineman were specific about their intentions to keep me on the left side.
Playing on the right bookend felt unnatural to me; I was unable to get a good punch on defensive ends to prevent the inside rip and I was caught off balance by blitzers. On the left side, I was far more comfortable; I allowed two sacks to another All-Conference player in my first game at the position and only one for the remainder of my career.
Reserve your criticism of Bell until he shows you what he can do on the left side. He might just surprise some of you.
Edit: Gettleman isn't the only believer in "left tackle feet". I was told by two coaches that I had some of the best "left tackle feet" that they had seen on film that year.