He is just too slow - something went wrong from player of the season to gash!
Carsley wasn't exactly quick but he excelled in that position and we've never really replaced him. Heitinga, like Carlsey, can pass a ball, and has got a decent shot from that 20-25yard area, and as long as he isn't ****ting out of tackles, he's a good defender.
We've never really replaced Carsley, and our midfield hasn't been as solid since. When Carsley moved on, we went from the 4-1-4-1 and ended up playing around Cahill in a 4-4-1-1. The only time we've really played the 4-1-4-1 since was around 2010 when Fellaini was dominating every game from there.
Gibson could play there as he can pass and tackle and likes dropping deep to start an attack, but Heitinga is probably more suited due to Martinez' playing style as he can drop in as a 3rd CB when defending. Think he's aiming for some kind of fluid formation that changes with the game.
...............Howard............
......Jagielka..........Distin....
Coleman......Heitinga...Baines
..........Fellaini.....Gibson.......
Mirallas.....................Pienaar
................Jelavic...............
If it's not working out and we need to play more attacking, take Heitinga off for Osman or Barkley (or a second striker if we're really desperate for a goal)