Maybe. However, that's not quite my view. I can't be sure my memory is correct. But for Exum, it was only a a fall of 1, I think. I don't think there was any way he was going above Wiggins, Parker, and Embiid (though there were questions about the latter's health). I do think Gordon slid above him at the end, so if there was something from the workouts, it was probably just with Orlando. For TH, I don't really remember him being above about 7 in most mocks and I don't think anyone really thought there was much of a slide when he went #9.
Exum only dropped one spot, but iirc he was strongly considered in a tier where he would go top 4. We had #5, and I don’t think it was ever expected that he be available. TH was discussed more around here as a possibility at #9, but he definitely had some hype of going much higher.
In the end….I guess where I draw the comparison is that all teams that worked the players out passed on them. Your comment sparked that thought. Could be nothing, but I wonder if their rawness showed up in their workouts which cause teams to pass on them.