Naismith's done brilliantly. But dave is right about Barkley being the only player that gives us that 'drive' from defence to attack. We'd have beat Arsenal, and i dare say not have been bummed so much yesterday, if Barks were fit.
When Barkley receives the ball on the turn, he spins and then he's away at pace, running at the defence. That's what he's good at. Naismith is more of a poacher - picks the ball up in little pockets of space and will lay-off a neat pass, but he isn't someone who's going to run 30 yards with the ball, nor should we expect him too. At what he does, he is the best in our squad. A clinical finisher, great positional sense and a brilliant work-rate.
But Barkley starts for me when he's fit. In the meantime though, he won't be fit for a while and Nessi is doing an excellent job. However, we have to change the way we play. Barry all day yesterday was trying to slot little passes into the position that Barks normally takes up on the half-way line with his back to goal. But doing that with no Barks is pointless. Naismith isn't that player, and Lukaku's touch means that isn't his strength either.
We just need to alter our play a bit while he's out, which in turn means we won't expose the defence as much by losing the ball on the half-way one with the full-backs pushed high up the pitch.