Naismith should be getting more game time than he has been lately for me. Osman, Barkley and Mirallas have all been quite poor and he offers a goal threat.
He has been quite unfortunate, he may not be the most talented player we have but he has proved useful on quite a few occasions.
If he had been playing in this game I would rather he had started ahead of Mirallas and Mirallas could have come on if Naismith was not performing effectively - plus Kevin would have got the message that his place in the first team isn't secure so he would have hopefully put in a much better performance.
Otherwise after Barkley and Deulofeu came on, I don't think Naismith or Jelavic would have made a big impact if they had come on later in the game for either Pienaar or Lukaku.