Olivier Vernon, whom fans longed for in free agency, a guy just signed to the richest DE contract in NFL history, at his combine measured 6'2" -- 269 lbs -- and ran a 4.8 forty.
Yet Bosa, who's been considered not only the best DE, but the best player on many boards all year, a guy who has remained at the top for Kiper, McShay, and Mayock even after a less than glowing combine 40 at 4.8, is suddenly viewed by fans as not worthy of the #4 spot.
For some perspective in an era of OLBs getting 15+ sacks, Charles Haley, except for one season in SF at OLB, had 10-12 sacks in his best, prime years in the NFL, but he brought pressure, absorbed double teams, and affected QBs. Bosa is not the type of player who goes bust. He's a hard working, high motor guy with the skills, moves, and techniques to have an impact even in his rookie year. Draft Bosa at DE and you get a guy with the versatility of Hardy who can move around the DL, a guy who will start and improve your pass rush while making plays behind the line for many years.