Anyone think that maybe Sardinha isn't being called up to keep, but to get rid of? The only way to get someone else to pay his major-league contract is to have them accept him in trade or off waivers. Since he was already off the 40-man roster, he has to be put back on to go through waivers again. Hey, it's worth a shot.
And don't worry, I have no doubt Corky Miller is higher on the depth chart than Dane Sardinha. But it sure makes sense to get a look at him in September and pass him through waivers again. Yaneverknow, maybe some team will bite and take him off the Reds' hands (and payroll).