Sure, players have to execute. But when players don't execute, regardless of the sport, it is the coach or manager that ultimately are held accountable. Some of the mistakes that we see - baserunning, botched plays in the field, lack of situational hitting, poor pitch selection - we're talking about basic stuff for competent major league players. I'd love to compare the Twins' pre-game workouts and walk-through's to what you get from a team like Cleveland or Kansas City because the Twins are more talented, top to bottom, than both of those teams.
As for the microlevel view of Okert last night, I would eat my hat if there was ever an instance this season where fans criticized Rocco for NOT bringing Okert into a game with the exception of a scenario where it was a lefty-lefty matchup and Thielbar got the nod and proceeded to crap the bed. Sands has been the Twins' 3rd best reliever all season long. Unless Sands was unavailable last night, there's zero reason to go with Okert. Part of being a manager is putting players in position to succeed and pushing the right buttons.