Disagree completely.
The combination of durability and stamina does indeed define the "best" role for a pitcher, i.e. starter versus reliever, but certainly not specific roles within those designations, such as setup reliever versus closer. Those specifics are purely left up to the manager to decide how to deploy each pitcher into those roles, based on the primary pitcher ratings such as control, splits, pitches, etc.
As I pointed out earlier, and many others agree, by designating a pitcher as a closer, you are often artifically limiting the number of innings he will throw in a given season. Your best reliever might only pitch 40 games/50 innings as a closer, but if designated as a setup A, he might get 70 games/90 innings. Over the course of a season, that's nearly 5 full games of work from arguably your best pitcher. Why would you want to leave that on the table? That's why, for the most part, the role of closer in HBD is often a disservice to your team.
The one exception to this would be the example that travis pointed out in his post. If you have a lights-out reliever with a low DUR/STA combo such that he's not going to get significantly more innings as a SuA as opposed to as a closer, then it probably makes sense to utilize him in the closer role. Those types of pitchers are few and far between, however. They are the exception rather than the rule.
Finally, I disagree about the comment about makeup. My experience and strong belief is that the makeup rating factors into development/decline only, and does not play a role in in-game performance. You may think that you're seeing a correlation between makeup and performance, but my guess is that it's coincidence only at best, and that you're reading something into your analysis that isn't really there because you want it to be there, at worst.