THey also didn't come from the trades.
What made the rebuild dumb was the focus on all pitching and on pitchers who already had Tommy John. Like tearing a ligament was the chicken pox where if you had it you wouldn't get it again. Not that it was likely indicative of bigger issues.
Anyway, you can't tell some people aside from the Heyward trade the rebuild was a collective whiff, because they don't get it. They will cite the positive of getting the competitive balance pick for trading Justin Upton and ignore the reality of getting a pick if all we did was let him leave.
THere was 2 great trades made in the rebuild, Heyward for Miller then Miller for Ender and Swanson. Those trades were great. The Upton trade was OK, I'd wish we got Renfroe and Hedges instead of the Petersons. The Gattis trade is a little hard to grade, mainly because a player like Gattis's value is hard to gauge. He was a star for us for a year, but he was a defensive bum and likely to age out of catcher really fast. But he was cheap and under control, I'd like to think we could have gotten one stud for him instead of 3 middling prospects. Though Astros Middling prospects from that time frame were quite good. THe Kimbrel trade was hot garbage, trade our closer for salary cap space? And the SImmons trade was just bad. Newk was a top pitchign prospect, but you cannot sell me on the logic of trading a young, cost controlled, 3-4 WAR player for one top pitching prospect. It's moronic. Oh yeah and the right to watch Erick Aybar for a season, can't forget that. We should have gotten Heaney as well. He was hurt I know, but he should have been included and I still would have said no to that deal. It reeked of a JS/Cox trade like the Tex trade where you want a MLB player in return so it doesn't totally look like you're rebuilding. Then the ****tiest trade of the era, the Olivera trade and it's fallout.
So we traded a young and controllable Alex Wood, a top prospect in Peralta, and 2 warm bodied (aka held some value) relievers for the right to save money from Bronson Arroyo, for a 30 year old who never played in the majors with lots of issues, like his inability to play defense at his position. That trade lead to the Matt Kemp trade, which was basically a like for like Salary Dump. Thankfully the Dodgers were willing to take him back if we took on some more money, and we traded Peralta and Wood and got a lot of wasted money, some replacement level production from Kemp, and Charlie Culberson.