It's probable exaggeration is similar.
I found the first link to be a biased (leftist) but honest attempt at the truth.
One thing I noticed, you didn't mention that the Stockholm Convention took place in 2004. Most environmental groups support something in a convention that was made more than 30 years after the ban. That was mighty brave of most of them. It beggs the question, which ones didn't. It didn't matter if USAID did if what Bates claimed was true. I get the feeling that all we are getting is spin and coverup. Indeed, how similar it is to AGW.
I have a personal interest in birds of prey. Off the top of my head, I could tell you the scientific name of just about every one of them in the US as well as some foreign ones. I have spent countless hours observing birds of prey. I knew where Red Tailed Hawk and Great Horned Owls nested and I sometimes monitored the young birds early lives. I love them dearly. The ban on shooting them is certainly partly responsible for their comeback. The effects of DDT always seemed to be a mistery. I read the National Geographic and other articles as a child which described the thinning shells. One thing that should be noted is that raptors typically have mortality with chicks so even if a percentage of eggs didn't make it, it might not significantly affect the actual population.
In the article you linked to it said, Multiple mechanisms may be at work, or different mechanisms may operate in different species.[1] Some studies show that although DDE levels have fallen dramatically, eggshell thickness remains 10–12 percent thinner than before DDT was first used.
When I see this, I think the logical conclusion is that there probably isn't a 10 to 12% thinning after DDT as they suggested. What is means is that their assumption was probably wrong and the natural thickness was 10 to 12% less than they assumed thus effectively exaggerating the effects of DDT thinning. The way nature works is that egg shells are only thick enough to barely protect the chick. If the shell is too thick, it will take extra nutrition to make it. Female birds have to store so much calcium for eggs that they have special tissue storage in their femurs (if memory serves). Obviously birds have to minimize their weight. In addition the chicks have to peck through the shells and sometimes need help getting out. If the shell is too thick, they die of exhaustion. I am not convinced that certain people weren't finding what they were looking for, not necessarily the actual effects of DDT. Again, it may thus be similar to AGW.
Then again, I think DDT may have caused harmful thinning. It is something that needed study. I remain skeptical of the ban but I admit that I don't have enough knowledge on the actual chemistry and biological effects.