The NFL Combine provides players a chance to address various concerns surrounding their draft stock. They could do it physically with a strong 40-time, or good work in position-specific drills. They could also answer questions with strong team interviews.
For a guy like Dorial Green-Beckham, both will be of some note to 49ers fans. DGB has been mocked to the 49ers in a few instances, and his potential combination of size and speed make him an intriguing prospect. However, he faces numerous question marks. He has dealt with marijuana issues, and an incident in which a girl was pushed down some stairs. He was never charged in the assault incident, but the incidents piled up fairly quickly.
DGB was dismissed from Missouri and transferred to Oklahoma. He did not play this past year, and so beyond just the character concerns, there will likely be questions about where he is at physically. He will get a chance to do plenty of work on the physical side of things with the various Combine drills when wide receivers do their physical drills on Saturday.
DGB has already begun trying to clean up his image with teams. NFL Network is running various draft profiles called "On the Clock". They did one with DGB, and naturally he had a chance to speak to the various off-field incidents. You can watch the whole video HERE.
In discussing his off-field issues, DGB says all the right things. He talks about learning to surround himself with better people, and avoid bad situations. That's all well and good, but as that Shutdown Corner article mentions, it's easy to admit fault in an NFL Network puff piece. It is possible he has figured out how to stay out of trouble, but I imagine plenty of people will be waiting to see how things play out for him off the field once he is in the NFL. Maybe he stays out of trouble and has a great career. Maybe he ends up out of the league in short order. We can't predict what will happen, which makes the pick all the riskier.