Okay, hate to throw the monkey wrench into the works here, but, these kids are producing at a really high level. Now I am not saying they have replaced Z and D, but they have soften the blow a lot. What you should ask yourself are the following:
#1 How much different would things be if you added D and Z, and subtracted Nyquist, and Sheahan? Because remember that on the perfectly healthy day roster neither of these guys made the cut.
#2 Will this team ever be perfectly healthy? Z is by far my favorite player in the league, but, he now has a pretty impressive history of injury. We can speculate on what this team would or could do, but is this team actually capable of being healthy anymore?
They may have started the season this way, but after a month or two of all of us complaining, Babcock DID scratch Cleary and Bert, and the team DID waive Sammy. Z, D, Nyquist and Sheahan have all been in the lineup at the same time this season, so it is not a matter of either/or.
People get mad at Babcock/Holland for the opening day roster - understandably - but no one ever mentions how the old guys got scratched/waived in favor of the youngsters once they got their chance. People make mistakes - even coaches - and are allowed to correct those mistakes. Babs hand might have been forced a bit by the injuries, but its not as though he is going to send Nyquist and Sheahan back to the minors once Cleary is healthy again....