While Slabhead works better in a low block. He's too slow physically and mentally (poor reading and positional) Eric Dier has the same issues. Needs to be playing in Italy or Spain. He's only useful at set pieces because his head so massive which also weighs him down when it comes to running
Don't get me wrong I think Maguire is subpar, but for England he's surrounded by defenders and a goalkeeper more comfortable with the ball than what he had a club level. At Leicester he was good, I am don't think he'll ever reach that level again but he should be able to have more good games this season than Johnny Evans.