I would be extremely excited for the Dbacks to add Pierre since he would be the ideal catalyst at the top of their order and fill several current voids they have, but I don't know why though the Marlins would demand Jackson since they already have highly touted 1B prospect Jason Stokes (also now the recently acquired Mike Jacobs) and have Cabrera, Hermida, and Reed as their long-term OF....
They wouldnt demand any pitchers since they're acquiring highly regarded starting pitching prospect Petit in the Mets trade who along with Olsen, Kensing, Willis, and Josh Johnson will form w/in the next cpl of yrs the best young rotation that would be the NL equivalent to the Athletics....
Of course the Marlins wouldnt want any of the offensively challenged Dbacks catchers (obviously Snyder and Hill) since they have Josh Willingham waiting in the wings to replace Lo Duca once he's dealt.....
That would leave probably the middle IF...the Marlins probably would want to acquire a 2B to replace the oft-injured Luis Castillo, but I dont believe they would be willing to take someone like the unproven Scott Hairston or the underachieving Alex Cintron..... They're getting a pretty decent SS from the Red Sox (Hanley Ramirez) who could potentially be starting in the ML, so that would rule out Sergio Santos....
Perhaps the Dbacks would consider including either Valverde or Aquino, however, we still dont know the status of Lyon and whether or not the Dbacks would be willing to spend money on either BJ Ryan, Todd Jones, or Tom Gordon.... Hoffman and Wagner are obviously way out of the Dbacks price-range....
One recent rumor I read had the Dbacks sending Vazquez to the Mets for Kris Benson and AAA pitching prospect, Brian Bannister... Benson could be an adequate #2 starter, however, he's rather injury prone, but actually did have a brilliant 2nd half for the Mets....
Another rumor (isolated from all the Vazquez discussion) linked Yorvit Torrealba being dealt to the Dbacks... I dont believe the Mariners would demand too much for him...He's shown some decent stats during limited playing time and is now expendable since the Mariners signed Johjima... In fact... Torrealba could also be a pretty good long-term solution at a position in which the Dbacks have somewhat struggled with since the inception of their franchise... Only Damien Miller showed some consistency over a relatively longer amount of time....
I just hope that the sequence would be.. the Dbacks trade Vazquez first.. perhaps acquire some uber prospects in that deal.. then trade one of those off in the package to obtain Pierre.....