Gurley
His only problem is an injury, but ACL's are not the career threatening or even career damaging injuries they used to be, nowadays you fix them up and a year later the player is like new, sort of like the advancement in Tommy John surgery in baseball, if the pitcher is young he comes back throwing just as hard as he did before the injury, sometimes even harder.
So the ACL doesn't scare me off with Gurley and before he got hurt he was the best combination of size, speed, power and agility I had seen in college in quite some time, reminded me a little bit of Adrian Peterson at Oklahoma. I don't anticipate he will fall to the 2nd RD, frankly I'll be shocked if he does, but if he's there at 37 I would take him in a minute.
As for DGB, his problems are a million times more severe in my view. Multiple drug offenses and a serious domestic violence on his rap sheet as well. Heretofore the dude has been a straight-up thug and that kind of guy doesn't usually change his stripes unless he has some kind of religious epiphany. And lastly, for all of his physical attributes and comparisons to Calvin Johnson, he wasn't exactly a dominant player even before he got kicked off the team at Missouri.
Granted there's a huge upside with DGB, that kind of size and speed is rare, but IMO there's a huge upside with Gurley too, he could be a guy who challenges 2000 Yards in a single season, and he's far less risky than DGB.