Tim Williams is a stud.
Kiper, on the other hand, is a dud, and given how horrible he is on NFL draft day, I think he's nothing more than a stooge for the teams and never gets any REAL inside information. I think they know he'll go running on TV with his standard, "Well, several GMs told me..." so they can gauge the reaction from some in the media and prepare how they want to approach it.
Kiper is the nerd who wants to be in the cool club so they pretend like he'll be there if he just does this or that little deed, but they keep (pardon the pun) moving the goalposts on him.