The fallacy of appealing to authority is asserting that because someone is in a position of supposed authority in some area, they therefore are "more correct" than anyone else who is not in the same position of authority... ergo, pretty much what you are asserting.
At the end of the day, the vast majority of people working in sports are frankly no smarter at their jobs than many people not doing so for whatever circumstances deem it so. Same as in many other jobs. Working in the front office of most sports organizations doesn't entail years or decades of specialized training or some kind of academic program... it's not like being a doctor or a jet pilot. Many of these folks who end up in these roles (i.e., ex-athletes, most often) don't necessarily even have college degrees. A great number of them end up where they are through connections and public profile. Hence, not by any definition any smarter than vast numbers of "non-professionals" who through application of simple logic and reason know a bad decision when they see it.
And I don't agree that the Suns are ahead of where they were two days ago. They are out one legitimate NBA scoring threat, one top ten draft pick, and one future first round pick of indeterminate value. And for all that, all they have gained is one questionable prospect (Saric), and a bunch of bench fodder that no one was (or is) especially enthusiastic about, with lots of injury and athleticism question marks surrounding them.