Not sure Devlin is my first choice midfielder now. Our midfield has been much better with Lewis/Rufer. Devlin has a fantastic engine and presses well but his passing is poor and doesn't shield the back four. Without Steinmann to cover for him, he just isn't the same player.
Devlin is ahead of any other central midfielder in this team by an incomprehensible margin. Would like him in a midfield three though, as you're right, he usually needs a holding mid to make up for his roaming tendencies.
Lewis and Rufer is more conservative, as even though they're two attack-minded midfielders they don't have high work rate/field coverage. Rufer's quite bad positionally, so he's a bad fit with Devlin; putting Lewis next to Devlin doesn't make the best use of his ability imo, though he might be nice as a deep playmaker. Just miss Steinmann man...