I dont think Green is as "fast" as some of you think. And I'm a UGA guy and see him play every week. I'd be surprised if he runs much faster than 4.5, which is still plenty fast enough.
Love him as a prospect but I think he will struggle a little more initially in the NFL than Bryant because he isnt as physical. I'm also not sure if he's as quick in and out of his breaks as Bryant is. Both have unbelievable hands and body control. I think Bryant might be a little better route runner right now too, though Green improved quite a bit this past yr.