lets be real here. other than rodri no one is reliable as a 6 in our system. yeah gundo can play there but then we lack any physicality in midfield (ball retention/recycling he is very good at but defensively he isn't anywhere near the lvl of rodri). stones was horrible when he played there. ake already looks atleast a lvl beneath our other players in his natural position. dinho can have good games for sure but he can't do it every 3 days.
zinchenko could also be an option but pep does not seem to rate him as a DM.
with rodri we have somehow the same problem as for instance bayern has with lewa. very important position, very high level player, almost never injured but if something would happen, you need someone to step up.
I don't think we have the player in our squad to do so.