jackson was probably the #3 target last year according to UF fans. SEC rivals noticed the thread, and brought up the time he slid to avoid contact. He seems like a physical specimen, but given UF's track record at WR, I'd rather stick with Maurice Stovall in the second than waste my 1st rounder on CJ.
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Now to actually answer your question. One huge development is the massive amount of training before the combine. Besides top physical trainers, there are a variety of other preparations, including practice doing improv humor to help you think on your feet. The interview on OTL made it sound like the scouts do not put too much emphasis on all of the extra training.