I never said you said Kroos was shit, I said you were hating on him because his defensive effort was low/non existent.
Maybe you are right with the Khedira cover thing, as Kroos' tackling ability and defensive awareness are questionable, and he needs a spry defensive midfielder on his flank so he can get into the attacking lanes and pick out the right teamate at the right time, as he has an incredible ability to find guys in stride and can open up the final 3rd like few other midfield players. (look how he plays with Modric, compared to Khedira, that's Germany's tactics that are at fault, you have to play to your strengths)
Boateng is amazing though. He just seems to get better with age and might be the strongest defensive player in the world.
Germany will be fine, they will go through.