Well again, I don't consider "Barkov level" to be poor play. Everyone and their grandma knows this shit is temporary, not sure why you insist on acting like a chicken with its head cut off like this is a new normal.
This happens to great players all the time, the fact that you think it's unreal it's happening is actually a credit to how good McDavid is because if this was a 27 year old Crosby or Ovechkin, you'd be used to these kinds of stretches. Leon has had a boat load of them in his career, December Drai damn well became a meme on this board for good reason because he played like a drunken ass for several Decembers in a row.
The fact that this supporting cast has no pride in themselves to pick up the slack for a few games after having a nice vacation is more concerning I would say. That's not something that's not as easily fixed.
The whole mentality that you have even is part of this team's problem ... they sit around waiting for Connor to do everything. Set the tone? Connor's got to do it. Not blow your coverage? Well is Connor scoring? Like what the f*** does McDavid have to do with guys like Kulak getting beat wide, Bouchard turning the puck over 500 times, Skinner not being able to make routine saves, RNH playing with no pulse, Hyman not being able to score anything that's not spoon fed to him, etc. etc.? They all look at McDavid to get going first as if they're waiting for permission to play hard. That's bullshit.
The Chicago Bulls used to be mocked as Michael Jordan + The Jordanaires because they would sit around waiting for Jordan to do everything for them, it wasn't until they shook that mentality that they started to win championships. It wasn't "well hey Michael you scored 37 ppg in your third season, now you have to bump that up to 40 ppg for us to win". In fact they only started winning when Jordan scored less, not more.
This whole mentality is part of the f***ing problem here. "Lets wait for Connor to get us going" needs to f***ing stop. That's not how champions think.