I thought
@Brownie just meant that they're no different as in they play the same role, not the age and experience.
Based on stats and displays - I'd say he's not ready to start frequently just yet, but it defo shows when Barry is tired now and Besic is a great replacement for the role. Think he'd be "ready" soon though, probably a month or two of cameos and the odd start and he'd be set. I'd like to see him in a pivotal role a bit more, man-marking the dangerous player and opening up for passes.
The whole issue with him, for me, is that he doesn't really play in the same/effective role he does for Everton, as he does for Bosnia, mainly because we play a different formation - 4-2-3-1, rather than 4-1-4-1 (or 4-3-3 if you will), as for Bosnia he's the only DM and it seems to suit him, as he has more players to pass to in front of him. For us he's playing alongside one more DM and a lot more is expected of him - to break up opposition play, get the ball back, redistribute it AND create chances/start attacks. Not sure if he's entirely ready for that, but that is something that he can work on and improve a lot in doing.
Then there's the other thing - Martinez seems to use him as he uses McCarthy - in a "free role" defensive midfield slot, which allows him to go forward a bit more, and we've seen that he's not exactly the best at doing that...
TL;DR - straight swap with Barry = great. What we're doing right now = not so great.