WRT the comment that you replied to - blitz protection isn't the problem. Brady's stats last year (as in previous years) were as good against the blitz as against zero pressure. It was when defenses were able to get pressure with only four or five guys (and coverage was good) that Brady's stats went into the crapper. Part of that, I think, was not having, basically, not enough legitimate targets. If Welker and Moss weren't immediately available, there just weren't any other options. That's why I keep harping about the Pats getting a couple WRs late who can consistently get open and catch in the intermediate area - even if they aren't burners/field-stretchers - and/or a very good receiving TE. Give TFB five good route-runners in every formation and ONE of them is going to be open nearly every play. At which point the pass protection starts looking a whole lot better.
BTW - Light is an interesting case. In 07 and 08, he started the season very well, but his play began to seriously deteriorate, both run-blocking and pass-protection, around Week-8. Having Vollmer as the primary LT and Light as the (relatively expensive) relief-man/backup might keep him fresh enough to finish a season at an elite level if need be. Or, as you suggest, Vollmer at RT to start the season, then move him over at about the halfway point. But then, there's Kaczur. So, maybe we see Saffold or Veldheer as a surprise 2nd round pick.