Bosox, BIG difference man. You are talking about Papelbon, a young flame thrower who was brought through the sox system properly and was fully ready for the majors both in demeanor and in stuff. Then you have Hansen who was rushed, and questions obviously abound as to whether he can handle Boston, the majors etc. If you want to throw Hansen, a guy who hasnt handled the pressure well at all thus far, into the closers role on day one, then you might as well give the yankees the east again. He still has some serious growing pains, as he should be in AAA right now if the sox cared about developing him correctly.
As for Cox, he was drafted last season and was successful, but only made it to High A ball for 13 games. I dont think you make that jump from a small sample in A ball to major league closer without significant risk to the player's development. If they care about bringing Bryce along and are trying to avoid what they did to Craig Hansen, then Bryce shouldnt touch the majors until mid season of 2008 AT THE EARLIEST.
Bard hasnt thrown a minor league pitch. If you think it best to give the John Olerud treatment (for those who dont know he never spent time in the minor leagues until a rehab assignment for Boston in 05) to a young pitcher who didnt even have blow away success in college as a starter, then you are rushing a player again.
Now, starting pitching is priceless, if it is high level, A-#1 talent that is can't miss. That is very rare. Of the minor league prospects who I put in that grouping, there are only two right now and that is Hughes and Homer Bailey of the reds. Previous A#1 guys IMO were Prior, Liriano, and Felix in Seattle. You dont deal those guys before hitting the majors.
Other than that, dealing kids who will start the season in single A is a common practice, assuming you deal the right ones and you deal them for the right reasons. If the sox wanted to nab Todd Jones from Detroit as a one yr stopgap, I'd be against dealing any strong starting pitching prospects, cause once those guys hit the bigs, Jones is gonna be gone and it will be the bagwell, larry anderson thing all over again. But when you are talking about a 25 yr old closer with major league success and durability, then you are gonna have to give up something to get him.
Now, anytime you package starting pitching prospects, especially highly regarded ones, you better get a sure thing in return. If you wish to say Cordero is not a sure thing, as Kilo so eloquently put it, then you have a good, sound reason to move away from the table. As for what I'd do in those shoes, I'd say, take Hansen (about the same age as Cordero and obviously not as polished) and then something is going to be needed to bridge the gap. They need pitching, and for a team that picks near the top every yr in draft order, they are one that never seems to pick pitching and if they do, they cannot develop it properly or they pick crappy picks. They want pitching. So, you say, take ONE pitching prospect from our system. And since none of them stand out as WOW prospects yet (either without the wow stuff or the wow production in the minors thus far) you can get away with sending either B or any other guy for them so long as it is not Lester.