The only defender we had who could step in seamlessly was Tomiyasu due to his versatility. We just have to accept that rigid players like Tierney and Holding may cause the system to malfunction because you don’t get the same level of distribution into midfield. If Tomi was available he would be playing left back ahead of Tierney I’d imagine.
It should be fine here against the worst team in the league but against the better sides it’s going to look very scruffy like it did last year.
Agreed re the distribution - which is why I think Xhaka might fix that at LB...