The problem with playing both Sidibe and DIgne is one really needs to be cover and neither is very capable of that. We don't have a central midfielder good enough to drop back either, IMO.
But of course he could use a totally different system. That's why the next few games will be extra interesting.
Yeah, that's where Gbamin comes in (for me). As a holding MF anyway, it'd be his job to cover for Sidibe when he presses forward. When I read about Carlo's tactical approach at Napoli (442 defending, 442 double 6/diamond whatever you want to call in attacking), he does use both FBs to attack, and the back 2 MFs cover where applicable. He also presses to a man as opposed to an entire team pressing. This allows the non-pressing players to focus on cutting off passing lanes. Granted this will also required those "interceptors" to have back up in case the pass does get by them. But I can easily see both Sidibe & Digne on the pitch at the same time.
I think many people get caught up in the "Sidibe is always out of position" nonsense when in fact he's doing what any good attack-minded FB does. We just don't have the MF support to provide cover effectively, and haven't all year. Sidibe leads the team in tackles & interceptions per game, btw.