Emi is a cracking little player, busy, always involved, technically very good and surprisingly good in the air for someone of his stature. I also like that he's willing to get stuck in. Unfortunately, he lacks pace (both at top speed and over the first few yards), which means he often gets caught in possession, and is less dynamic in helping us transition from defence to attack. Which is why I don't think he's ever going to get into Unai's team, long term. If he was quick over the ground, he'd probably be worth £50m.
All that said, I think he's a good squad option if we can't move him on to free up some funds, and he'd be a useful option from the bench when we're trying to break down tiring defences who are sitting deeper and deeper (where his lack of pace becomes much less important). I don't see him starting too many.