I don't think thats a fair characterization of PFT personally. I've been reading them for years and they often, very often, come up with stuff way before it happens and before ESPN gets any rumblings of it. The problem is that they do a lot of commentary in the form of asking some scout on X team what they think of say, for instance, Marino being the GM of the Dolphins (when he's not really the GM he's the head of football operations) and the lowly scout will be like "Where the heck do these guys come up with this chicken **** idea?" etc.
As for the Dolphins GM search even though they overall were criticizing Miami they really hit a number of nails right on the head. One was they hated and criticized every candidate Miami brought in, basically saying that only a few of them had experience on both sides of the ball with the draft AND free agency, and that Mueller was a big headed ego trip with tons of baggage. This wasn't their personal opinion, this was what they were hearing around the league. Yet they heard good things about Rick Spielman the whole time, that he would be snapped up in a jiffy by Detroit if we let him walk away. They also criticized the dog and pony show being run by non football guys like Huizenga and Jones, taking the criticism from their sources.
And sure enough, not only did in the end the Dolphins recognize that Spielman was the best candidate for the job, but the Dolphins hired Marino to run this kind of thing in the future so that they wouldn't be susceptible to criticism that the show is being run by "non-football" guys like Jones and Huizenga.
There's countless times PFT has been right. Of course, they've been wrong too....but I would expect that, cuz their sources can be right or wrong.