I term natural (insert position) bothers me. I picture scouts going up to newborns saying "oh look, at that cure little right-defenseman!". Despite not being born a RW, Seguin is certainly a right winger for them now.
Iginla has played RW his whole career but they put him on LW and nothing exploded.
It's something you have to consider with wingers and defensemen, especially with older ones. Nowadays you're seeing more kids who are comfortable on either side, but not every player can do it. Seguin is a case of a center moving to wing, but they've also let him settle on the side where he was most comfortable. We're seeing issues with Gaborik as well as Del Zotto. Neither looks terribly comfortable on the opposite side, and therefore their effectiveness is weakened.
He lined up there, but he spent most of his shifts playing to his natural tendencies on the right side. Neal does the same thing. He's effective as a shooter coming down his off-wing, but he drifts to the left quite a bit.
A player who isn't comfortable is not an effective player. Jagr relies so heavily on being able to protect the puck with his body that I can't see him having as much success on the opposite wing.