Johnson's made it clear that he expects, and needs, all 25 players to contribute. He's not going to sit guys for up to a week at at time. If they can't do their jobs they should be replaced.
And of course with today being a double header and the start of a string of 11 games in 10 days, everyone in the bullpen is going to be needed. Everyone.
But he has to have a sense of when to use pitchers. What if we're losing the next game by 6 runs, it doesn't matter which reliever you go to. This was a winnable game...until Sean Burnett took the mound.