Qwiss I'm not convinced this is better than having a normal left back and a more creative midfielder.
We need one left back who is defensively focused. Both Tierney and Zinchenko have been well off it lately. If that player also has the grace and guile on the ball of a true central midfielder, great.
We were questioning where Tierney was against Liverpool but when he came on he gave up several terrible chances within minutes. It's unfair to ask him to do what Zinchenko does but he's not exactly lethal on the overlap either.
Zinchenko's had a flinch on a crucial block get deflected in, gotten monstered by Salah, and then let Culeta-Sar ghost off him for Southampton's third last night. He's barely a defender at present.