You have a very condescending manner, good for you.
I completely disagree with the notion that McCarthy is the dynamic centre mid that you make him out to be. That's backed up by his assists/goals ratio. As someone who runs around a lot and gets stuck in I think he does a good job.
For us to threaten the top 4 I think this role needs to be filled by someone who can offer more in the final third. The standard is set by Cazorla, that's what we should be aiming for. Tbh, I'd drop Barkley back in there to go towards this, at least at home against teams who have no intention of breaking out of their own half.