I wasn't saying those guys aren't solid bullpen members, they just aren't really closer or even set up candidates. To be fair I never really viewed Kintzler as a closer type either
I'm not sure it's really fair to make that statement about a few guys who haven't even had a full season yet. There's ample reason to think they will all improve, and they have the peripheral stats to say they can do it.
Personally, I could care less about who is in the 9th inning. I'm far more concerned about the 3-5 guys who consistently come in during innings 6-8. That is where we need shut down guys. I'm fairly confident in Hildy at this point, and think that both Busenitz and Curtiss can get there, but I want at least one more (if not two) option that is reliable. If the guys in the minors get healthy and force it, then we have a nice problem. But I'm not sure how much I'd rely on guys like Jay, Burdi, Melotakis,,and Chargois at this point. I think you can safely expect one to emerge (none of whom should be expected to contribute out of ST), beyond that, it's a crap shoot.