In three receiver sets, Kenny Britt will be on the field, but when there are just two, expect to see Kendall Wright usurp Britt's starting spot at the X position.
First of all, Britt was awful last season. There were several times where he completely disappeared on the field, not to mention lots of drops.
Second, Britt is a headcase, and no one expects the Titans to re-sign him when he finishes out his rookie contract at the end of 2013. The Titans should see just what they have in Wright, who will be in Tennessee for much longer.
Lastly, if you watched many games last season, it was clear that Locker likes to throw to Wright. The Titans will field whichever targets Locker makes the most use of, and right now, that'd be Wright.
If Washington is still with the team by the season's start, then he'll probably stay at the Y position he's filled for the last couple of seasons.