I'm assuming it's a keeper league right? In a redraft you could make a pretty compelling case that either of these guys might post the most value for the remainder of the season. I know Heyward is filled with potential and will likely ascend to beast status, but when? His hype is no hotter than was Wieter's Delmon's or Alex Gordon's. It could take a few years to realize his potential and that's only if he gets past what appears to be some JD Drew fragility issues. There is another comp; remember what a can't miss superstar JD Drew was going to be? I'm sure Philly fans haven't forgotten him shunning them after blowing their top pick on him.
I wouldn't get too worked up over this one. Not sure if you all do a lot of trades in that league or not but in heavy trading leagues this deal wouldn't normally cause a huge stir. Gardner has moved 4 times this season in our league (12T mixed roto keeper) and Heyward once:
3/27 - Gardner along with Broxton for Rasmus and Nathan
3/28 - Gardner and Dempster for B-Rob K-Rod and Domonic Brown (we have special keep rules for rooks)
3/29 - Gardner along with A-Roid Bumgarner and Dempster for Haren Oswalt Mcghee Moustakas and Fred Sanchez
4/8 - Gardner Napoli and Hellickson for Mauer and DeJesus
5/12 - Heyward and Jamey Carroll for Kinsler and Wieters
MVP****NL11,AL07,AL05,NL04,ALNL03,ALNL02,NL01,ALNL00,AL99,ALNL98,ALNL96 RIP Cammi
Cmon Bud, NOW is the time to sack up and force feed an Olympic style drug program down Fehr's fat throat. Save OUR game from these blatant cheaters!