I'm not considering Heyward in any trade. Nor are the Marlins considering trading Stanton. But it's not unfair to note that, in the abstract, Stanton is the more valuable property of the two of them at this time.
I don't think Headley would be that much cheaper to acquire than Upton, honestly. Similarly elite player with upside and control remaining. Plus, the Padres pretty much said flat out today that they're not trading him. Choo will also require a significant piece; expiring contract or not, he's still plenty talented and plenty valuable. It wouldn't be a big multi-player package, but he could easily cost a top arm. Finally, Dan Uggla isn't going anywhere without the Braves eating most of his salary. Even if they were willing to give him away, no one would take him. The Braves have no leverage there.
I wouldn't trade Minor for Fowler in a month of Sundays, given Fowler's dependence on Coors Field. But as beldugo noted, this does show you that Minor is in demand, and the Braves could potentially do much better selling him high than selling Teheran or Delgado low.
Meh. Wren has to say that in order to maintain his leverage. At no point during the winter can he afford to appear desperate. So I do still think he makes an acquisition. With that said, though, there actually is a solid amount of upside between Juan Francisco and Evan Gattis, and there comes a point where I would almost rather him NOT make a move. Rather than overpay for someone mediocre like Shane Victorino or Ryan Ludwick, I would just as soon see them try their hand with Francisco and Gattis. Hopefully it doesn't come to that, and they're able to make a trade for a solid stick in left field...but if not, I might rather take my chances with the kids with upside.