Other GMs see the same things we see (and probably more since they have a bunch of scouts to see things for them).
Rupp wouldn't not have garnered a huge return, no one breaks the bank over a half year for a guy with a limited track record of success. More than now, sure, but a lot, no way.
If we trade Franco, who plays 3B? And who will give us a return commisserate with his potential upside? No one, because only a rebuilding team would gamble on his upside, Hey, isn't that us?
Galvis isn't exactly in high demand or there would be rumors that someone approached Klentak with an offer. And Crawford isn't ready. If Galvis finishes strong, he has a full year of steady improvement and his value goes up. If not, he's a second tier starting SS/top utility guy which is his current value.
Hernandez might have been a hot commodity before he was injured, now he'll be worth more in December if he finishes strong. A team would trade for him to leadoff and play 2B for 3-4 years, that has real value.
Neris has little value, he's not even a proven set up man and he's a failure as a closer.
Most of these players will have more value in December, like I've said, July trades are about PROVEN commodities, someone who can help now (and sometimes next year).
December trades are more future oriented, teams adjusting their roster for the next season.
The trade ship left the station after 2012, at that point we had very attractive veterans who would have garnered a huge haul, and we could have accelerated the rebuild by a year or two and be competitive by 2015.
By waiting until the summer of 2015, RA basically reduced the value of every asset, including Hamels (at 27 he'd been the centerpiece of a huge deal).
Now we simply don't have attractive pieces, other than a healthy Hernandez.