See, I don't see it that way. It's like people have it stuck in their FIFA/FM brains that playing Kone and Clev out wide is immediately narrowing the play. I've watched the games, and it's simply not the case. Everyone wants to see Del and Mirallas starting on the wings...fair enough if we try it, but for me Del is an impact sub...that's his role.
I won't disagree with you that Barkley should be deeper...Bobby also sees it IMO. His subs in the Watford match show that. People want to slate him for being stubborn, but he completely changed the shape for the Watford match and did the same for Barnsley. Maybe he's gun shy away vs a PL side.
My gut feeling is that Bobby hoped Ross would be his #10 to bring help him to CL football. He's realized that while Ross offers loads, he's not the locksmith we need to unlock those parked buses.