You have probably all read this:
I think it relates to the Rays' situation and to another discussion we have had recently. While the implied conclusion may be too heavy for the evidence to bear at this point, it is certainly provocative and worthy of consideration.
I have been hoping for a few years that the Rays forgo the rigid role bullpen, something they seem unwilling to consider. But perhaps they can take an intermediate step as suggested by Posnanski.