He might have had a high RAS score, but that didn't equate to production on the field. So what do you think his problem was last year? He didn't show the athleticism to play LT. The DE's were either bull rushing him or running around him. He was so flat footed. Might as well had put nobody at LT last year when Penning was in the game. At least that way you know as a QB you had to get rid of the ball quick.
If he has the same issues at RT, you can't wait until the 4th or 5th game of the season to make a switch. Season would be over by then.
My neighbors' daughter aced her driving quiz. 100%. Couldn't get out of a parking lot because she was petrified of actually driving. Test score didn't equate to production. She UBER's well though.