I wouldn't for a couple of reasons...
1. If you trade Crawford you have virtually zero SB on your squad, he is the only saving grace you have for SB.
2. You have a lot of good average batters (Utley, Arod should increase from last year, Vic, Hawpe, Vlad and maybe Molina and Drew) but you don't have any great average bats (meaning guys that consistently bat over .300) and with Howard already anchoring that average down Dunn would have the potential to sink the ship.
3. I love adding Ubaldo, but your SP staff really isn't THAT bad as it sits. Gallardo isn't a true fantasy ACE, but is a solid SP1, Hamels has the potential to be SP1a, Z is struggling and about the only down fall I see in your rotation, Baker and Hudson I think are primed for very nice years and could turn out to be #2/#3s rather then #4/#5s. Plus you have Gio who is a high upside K guy, and Davis who could chip in some quality Ws for you.
4. Overall your team is built around power, and I think losing Crawford you are looking at basically punting SB each week and your average will dip considerably.
Also what trade did you do with Verlander and Gallardo? I REALLY hope it wasn't straight up, can't believe it was but... Oh last thought also, Pure Player value you would win the deal thus I don't think the other team would do that deal anyways. Just not a good situation if you lose CCSB.
Great thanks to soto for the sweet sig!...