On the contrary Mccarthy will push the issue, just not in the attacking midfielder goalscorer way you are talking about.
He will constantly move and show for the ball. He is not as much of a crab passer as some people are making out. I have watched all his games for Ireland and a lot of his Wigan games and one thing he will do that nobody in our midfield does, bar Felli in monster form, is break up play with a timely challenge/interception often with a sudden burst to get to a ball he is second favourite for.
From these moments the teams who were coming out to attack, probably after parking the bus as we've seen so far, are suddenly out of position and on the back foot. This will assist our attackers in getting more room to manouver in. Perfect for the likes of Mirallas and Deulo to work with.