Tom Lees is more of a blocker than a tackler.
With blocking you give less fouls away and don't leave yourself stranded but you are more likely to concede a higher position as you back track.
It can also give you a bit more time for other players to get back and help.
With a vocal keeper it is a better way of defending as players want you to commit to the tackle so they can draw a foul.
He's also solid in the air, even if he cannot win the ball he will do enough to put the players off.
Loovens was more of a blocker to, the defensive line kept it's shape mostly and it showed.
However Iorfa and especially Borner get drawn to the ball to try and pinch it. Giving fouls away or getting caught out of position. Iorfa has the pace to recover, Borner doesn't.
Given that both can be caught out, the defensive line stops being a line and is easy to exploit.
Playing against us last season any ball just had to go Borners side for the majority of the time because he will come and leave a massive gap behind him. Iorfa had to cover a lot and had the pace to do so. Lees not so much then depending if Palmer was ambling back a huge are would appear on our right hand side.
Pass up near Borner, a quick return, through ball in behind.