Well there's only so much you can do when you play in front of the defence and in front of you there are multiple attackers. I don't know what the expectation is of these guys that are playing so deep. Like Pjanic gets shit all the time on this forum. I don't know what they want. To dribble the ball 90 metres? He's just going to touch the ball and pass to the guy who is open.
If you criticize a regista, you have to definitively show the runs that he missed. If there are no runs to miss, and he passes sideways, what is the complaint? If Ronaldo makes the run and Can fucks it up, I get it. But he didn't, so good job I guess. Were there other instances where Ronaldo had a goal opportunity and Can fucked it up? I don't think so but I missed the first few minutes.
And I think ya, in most of our matches Khedira could literally do the job. I will say that Can is a little more switched on defensively and aggressive in the air so he might protect Bonucci in situations where the other options can't. But other than that, there is not much to do in this position for a vast majority of the game. I mean, look at Cancelo, he is playing as an attacker as well. Just get the ball off your foot and up the field, good enough.