Imo, we have already seen this problem in the past with Fern trying to babysit Yaya week in week out.
KDB at times moving deep, enabled us to do it last season & we look much better currently when Bernardo goes in there. But imo we are already not making best use of the resources we do have, by not getting Foden involved more & getting Silva & Fern off the pitch & by the way we have underused Sané.
KDB is a massive loss for us, his aggression and closing down not to mention his energy and offensive attributes would be a loss to any team. I doubt Foden would bring that but hed def be a wild card with youthful energy and an unknown element. Gundogen offers nothing for me, truly unspectacular and it inhibits Benardo on the right. Bernardo coukd play there but needs ober lapping runners like the Sane/Silva partnership down the left. Gundogen stays too central and offers little, Walker last night held back in a back 3 whilst Delph tucked in to midfield so Bernardo had no outlet. Surely Pep can see this as a big problem and will sort it but I fear where Gundogan is concerned he has a blind spot for him.
Agree, Sane is the dynamism we need and shoukd play week in week out, defences simply cant cope with his speed and trickery and the difference last night when he came on was there for all to see.
It's not that much of a problem imo provided we realise there is one, & start to do something to fix it. We don't need the perfect midfield in most games, in order to win. In some though,, we need everyone at 100%.
Last weekend's bizarre subs, 3-0 up v a wide open Fulham team, was a waste of time imo.