"Unfortunately, Ober hit a wall as the calendar turned to August while he also passed a new career-high in innings pitched. Over his subsequent six appearances, Ober's performance struggled mightily. He allowed 21 earned runs in 28 innings with opponents hitting .328/.377/.588 (.965) against him, including eight home runs. "
"Ober has proven himself at the big-league level and is part of the team's long-term plan for the starting rotation. It's tough not to think he's gotten the short end of the stick on multiple occasions this year."
These statements appear to be contradictory. Ober needed a rest and he had options (and had already been optioned), so IMHO the FO was correct in sending him to STP. I also believe that optioning him was better than putting him on the IL. I believe a player can be recalled after 10 days, while the IL requires 15 days. He is currently eligible to return from STP.
Edit: I believe he will be recalled if DK doesn't pitch well Friday.