Maybe this is a bit biased since i'm a bucs fan, but i'd even recommend starting ward over either Jackson or Bush (I don't see either having a good game). Then finding another WR or HB to start in that flex spot. Glen Coffee against STL seems appealing with Gore out now if he's still available. I wouldn't start LT this week no matter what. Even if he's healthy, he's facing Pit, will still split carries, and wont be 100%.
Even if Tampa airs it out all day, which i don't think will happen since the redskins had problems scoring against the lions D, Ward is a receiving HB so he'll get a few screens his way, especially with a more elusive QB this way. Williams is still not 100% healthy (as usual unfortunately), so Ward's value may go up down the road, so i wouldn't cut him.
I think Bush would be the guy i'd sit this week. Then i would start Carlson at W/T if i couldn't find another solid wr or hb on the waiver wire.