For me, our most intriguing signing and so glad we got him. There is no logic to having either Rose or Davies in the same match day squad once Sess is fit for the bench. Poch needs to pick his LB for the game and rest the other, which probably isn't good news for Rose. We all expect that.
A bigger disrupter though is with Lamela and Moura. You never see a scenario where Son isn't involved but would one of the other 2 miss out if Sess is on the bench covering the LB role? I've seen Sess playing for Fulham from the right when Babel joined them on loan and he clearly has that string to his bow along with his left sided attacking play. Lamela and Moura are great impact subs themselves, so he has his work cut out to get ahead of them though.
There is absolutely no downside to having Sess. This is what squad depth should be about. A 19 year old with no baggage that wanted to be at our club and desperate to get started.