They've lost Morales, Hanrahan and Miller so far this year--for the year. Bailey imploded and is struggling to come back. The BP has thinned out, and they don't really have good replacements in AAA. So logic says deal for some relief pitchers, or at least move some of your best AAA pitchers into a relief role. So far they've done none of that.
Webster and Delarosa should be viewed as candidates for the BP right now. It's about winning now, and you worry about future roles in the future.