Throwing $#%& against the wall here... Evan Mathis trade, maybe? No news tying Texans interest to him, but you figure with Meyers gone someone needs to move over and with Sio not doing all that well last year C/G might be an area where BOB feels a vet is better than an unknown. Especially considering the (mediocre) QB situation.
http://www.rotoworld.com/player/nfl/3216/evan-mathis
Mathis graded out well last year according to PFF.