first off, I dont think BP is worried about C Long playing LB or DE. That is why his value is so huge! He is multi-talented and athletic with instincts to boot. in teh 3-4 you are a rushing LB when playing outside. His size dictates the ability to move him around to both spots, which is why he would fit BP's defense to a T.
Stop with this "he hasnt played this position before" crap. the fact is, the dude knows how to play football. PERIOD!
now for Jake Long. Those who claim he is not a LT obviously have not taken a good look around the NFL lately. I know one thing for sure, he would be a hell of a lot better than Matt Light of the NE Cheatriots and better than D'brickashaw. Jake Long is a beast! He has the wing span and mentality to do the job. Is he at Joe Thomas' level? a notch below, which dictates that he is a good LT. End of story.