"Surely the Pelicans would have protected the pick if they could have, right?" "Dumars did indeed call other teams picking between No. 8 and No. 12 trying to make this trade and was rebuffed, perhaps suggesting to him that the pick had to be unprotected in order to get across the finish line."
You left out chunks of the reporting that, IMO, seem important. He mentions being rebuffed as a suggestion that he had to unprotect the pick. Which would imply that the initial offers were with protections on the pick. And I believe I read reporting elsewhere that initial offers were offered with protection, but then Dumars was getting desperate and unprotected once it got down to Atlanta.
Making the trade with protections doesn't seem nearly as good to me. Obviously, we don't know what those protections would be.