Heyward is a different case. The issue appears to be that he's soft (Chipper Jones has criticized him for not playing hurt).
I think at 22 that is very forgivable... Just because the guy is built like a man and is a professional athlete doesn't mean he is a man or a professional. I know how much I changed mentally from 22-25 and from 25-30. He's kind of learning on the fly. I think what Chipper said should have a positive effect(tought love) on him, but who knows if it created a rift between the two.
If the Braves are looking at moving Heyward now, I think its the perfect time to go after him... But as mentioned earlier in the thread, the Braves have players in the positions that the Reds have the most top end talent. He's definately worth looking into if he's really on the trading block.