I'll try to keep this short. Here's a list of all of Gose's qualities:
* Speed - Two seasons in the minors he exceeded 70 SB* Good glove in CF with great range* Improvement in OBP* Has shown limited power potential (16 HR in AA ball)* Arbitration clock just started ticking... under team control until 2019* Was rated 39th best prospect in MLB pre-2012 (too many AB's at the MLB level to be listed as a prospect heading into 2013)
Keeping the above in mind... he's only 22 years old.
As a second piece of a trade to the Mets (assuming the centerpiece is d'Arnaud) this potentially could be a very nice addition.
Hit 16 HR in 2011 AA ball... as a 20 year old.
Compare that to our best positional prospect Flores: Flores hit 18 HR as a 20 year old split between A and AA ball.