Two position switches have been brought to light over the past few days:
1. Carson Butler has apparently moved to DE. This is probably because he can't block worth crap.
2. Vince Helmuth has been playing DT in practice. He came out of high school as a fullback who also played some DE. Then Mark Moundros came out of nowhere and beat Helmuth out for the FB job. I thought it was strange when I saw Helmuth listed at 262 pounds earlier this year, so he either ate his way out of the FB position or he bulked up for the possible position switch.
Helmuth's switch is supposedly not permanent, but when a guy starts seeing practice snaps on the other side of the ball, that's got to be a sign of something.