Probably because Naismith is so valuable to us helping out the defence...naismith has an excellent engine and for Everton can get up and down the pitch, helping out in attack as well as defence. In fact, the value of having Naismith on board cannot be underestimated as far as Roberto is concerned. He plays Naismith as a forward player, knowing that he is also an extra defender, its Robertos compromise, diluting his 'all out attack' philosophy just a little. Under Martinez, |Naismith or a similar player will always be on the team sheet.