BTW, I like Casey at FB because he can motion out to the end of the line and present confusion for defenses. What does a D think when Casey leaves the backfield and lines up on the end of the line? They don't know whether to play Arian Foster on the run...or will we play-action to Arian and throw to a guy like Casey who beats LBs in a foot race every time? If they freeze up and play the pass, sweep Arian to Casey's side and Casey is now blocking on the edge for him. If they play the run, but it's a play-action pass...they've bitten and cannot recover in time to locate and cover Casey properly.
I think you use Graham or OD out there, or even BOTH of them, and you use Casey at FB on certain plays. That's a nightmare for a defense: A Texans 2 TE set with Casey also at FB, and Foster at RB, and AJ at WR split way out wide. That creates soooooo many options for our style of offense.
A defense would have to account for everything: The bomb or slant to AJ, two capable TEs who can run a wide array of routes to exploit a defense's formation, the run game with Casey and Foster, Casey as a receiving threat, Foster as a receiving threat, the list goes on and on.......