You can be fit or fitter than others but still not train as hard as you could/should be. Again, I'm not saying it's true, but I wouldn't rule it out. Kreis said that Mix (and Poku) had to practice harder. I discounted that. And early in the season (even when he was still in favor) PV stated that Mix needed to work harder in training and mature (or something along those lines, also grouping him with Poku). As for the latter, I was actually surprised that he mentioned Mix. It may be BS, but it also makes sense. I don't believe there is some extraordinary justification they are withholding from us.