Moyes definately likes versatile players which was probably the main reason he went for Heitinga.
He said when he brought Neill in that he'd fill the gap in the squad that Neville being injured left.
Only now is it apparant that he meant he'd go into the back four and allow Heitinga to fill that gap jointly with him (Full back and Midfielder) than just have Neill be a like for like replacement.
I still don't think he's a long term defensive midfielder though, and playing Rodwell and Heitinga will do for now as a conservative formation in light of injuries but it's just a modern day version of the Carsley-Neville partnership. Too negative and unbalanced a midfield to really control games and once more midfielders are fit again we shouldn't be looking to deploy that partnership even in big games.
When everyone is fit we'll have a really good squad with different options and players so we could choose from Neville, Rodwell and Heitinga for DM, Neill, Neville, Heitinga and Hibbert for RB and Cahill, Fellaini, Pienaar and Billy for AM. A squad with all kinds of different options.
It's a squad game but for me personally Heitinga would be my right back in an ideal Everton XI.