yeah your SP sucks and if you can get away with ~3/ish closers (i have no idea how long aaron crow will close, as it's in KC's best interest to get soria back and closing... i personally think he's gotta be hurt or something, what with his curveball disappearing over the last year or two and his performance this year) but getting a brett anderson would be a big move for your staff, whether it's roto or h2h.
are you in a roto or h2h league anyways? keeperS?
if it's h2h i think it's a more-yeah trade because like, you can live with less closers in h2h, depending on how the other teams roll (i personally have 6 closers and say SAVES ARE MINE every week but i see myself paring them down for the playoffs to have more offensive optiions / better SPs) but yeah, even tho chris perez is a quality chunk of your saves picture and i dunno aaron crow's long term value, you can make this trade and stay vigilant and jump on new-closers as they pop up during the year, so like, seeing as you have aaron crow you're already doing that, and seeing as you have santos too (i had to jump on him early but i live in chicago and i felt like his closing era was coming and now it's upon us)
so yeah, you'll get the ace of your staff out of this and one way or another you need SP so i'd go for it.
check out mine, would ye? viewtopic.php?f=26&t=432547