Rusty Smith, QB
Collin Mooney, FB
D.J. Woods, WR
Chris Morris, C/G
William Vlachos, C
Dave Ball, DE
DaJohn Harris, DT
Chris Hawkins, CB
The practice squad, believe it or not, is an important part of a team. When you have players that look like they might become pretty good in the future, but aren't there just yet, or solid backups that you just don't have room for at the moment, you throw them onto the practice squad.
Smith has progressed a lot since his only start, where he threw three picks against one of the worst secondaries in the NFL. However, like I said before, there isn't room for him. The Titans probably want him to be the long-term backup to Locker though, so they'll hold on to him if they can.
Mooney could make the roster if he beats out Quinn Johnson. The loser will probably see a practice-squad spot.
Woods looks like a receiver who could end up being good as a returner, or even a depth receiver. He won't make the roster, but the Titans will keep him if possible.
The Titans may end up needing new bodies at the interior line, so they'll keep Morris and Vlachos available to them on the practice squad.
Ball may retire since he got another concussion, but he's a solid player, so I could see him sticking around on the practice squad.
Harris has some upside as a backup defensive tackle, but the Titans are already deep there. His talent will keep him on the practice squad anyway.
Finally, Hawkins is a valuable veteran who could be a good backup if anything were to happen to a starting cornerback, so the Titans will find a way to keep him at their disposal by putting him on the practice squad.