He'll never play dedicated full backs if he can shoe-horn his favourite players there. Cuellar's an excellent CB, but he's no RB.
Poor Luke Young. Poor Habib Beye (only a bit, mind *wink*)
Cuellar offers nothing going forward like, solid enough at the back and i guess he's a danger at set-pieces but the few times i've watched the Villa recently attacks peter out badly when the balls come to him. I think its accentuated more when you play Downing RW with him more wanting to cut in on to his favoured left peg and Cuellar is left to fill the gap.