I'd say it's the opposite. I think having a solid base in midfield will help us both with and without the ball. With the ball, we'd have more of a solid midfield and should be able to keep the ball better against better opposition and against the teams that press us high up, (we're currently awful at keeping possession against teams that press us, especially when our entire game is built around keeping possession). Without the ball we get absolutely ripped apart by not just the best teams but average teams too. It's just fortunate that in the league we're generally the best possession team there is so we don't lose the ball much and therefore the huge defensive weaknesses in our system aren't exploited as much as they otherwise would. Then we get to the champions league where suddenly we don't have 70% possession because we can't keep the ball against better teams and we look lost and sometimes amateurish. Unless we reach Barcelona's standard we'll never win the champions league with the current system imo.
You;re right about both. regarding his pace. he occasionally looks like nobody can sprint past him then 2 minutes later the very same player will practically walk passed him. It's an odd one, i'm still not sure whether he's quick or not. And the system is going to make anybody who's main purpose in the team is to offer a defensive contribution look a lot worse than they are. The players are (almost) all there, to win the league anyway, it's the system that's letting us down.