I don't see Diaz as a turnover machine. In that regard, you should look at Gorges and Gill. Diaz makes mistakes, but he also does a lot of good things. His first pass is more often very good than not. He has lots of upside offensively. Rather than give a day off to Diaz, I would rest Gill from time to time. Spacek might also get some rest when Markov and Campolli will be back. To summarize, I am impressed by Diaz and Emelin so far, but I understand that they are prone to mistakes, because they are rookies. The problem is that they need the ice time if we want them to play to their potential.
BTW, Diaz and Weber might have some similarities in their play, but Spacek is very different.