To make this true, a stud closer (whether you adhere to defined roles or not) is needed. Perk, as you say, can be that guy but currently simply is not. Needing to cast either of these two in the stud role may work, but potentially will expose them, though we have high hopes for May. I've been slow to accept May as reliable in this role. Anecdotal evidence for me is that he gives up a lot of squared up hits, whether caught or not, and is perpetually one mis-located fastball away from blowing any close lead. However, I took a look at his split stats, and he seems to have a moderately high BABIP, around .340, as either a starter and reliever, and conventional wisdom says that will come down of its own accord. That in turn would make his current 3.03 ERA as a reliever begin to look very effective indeed. Maybe I just need to take a breath and relax when he's called in.