I would say the CBB to the NBA is a tougher transition. A lot of coaches cannot coach up to the speed of the game and it's actually harder to coach players with very high talent levels. The coach of an NFL team has less of a gap imo and the plays and schemes in CFB are translating to the NFL due to this new breed of Hybrid QB ala Kaep, Russ and RG3. If you look at teams like Alabama, LSU, USC or even 2nd tier teams like South Carolina and Winsconsin are basically NFL teams, in College ball the best College team would get killed by say the Toronto Raptors.