I think Jahvid Best is the biggest risk/reward guy in all of fantasy football right now (at least in PPR leagues). I took him at 9.05 in a 12 team PPR dynasty startup a few months ago knowing full well that there was a chance he would never play again. Or that he'd come back and take one big hit and be out for the season (or career) again. His injury risk is as high as there is in all of football. But the reward is huge as well. He was averaging 4.5 receptions per game last season. Over a full year, that's 72 catches. He was also averaging just under 50 yards receiving and 65 yards rushing per game. Over a full season, that's 800 yards receiving and over 1,000 rushing. So, his pace was 1,800 total yards, 72 catches and about 8 TDs. Almost 300 pts. in normal PPR scoring. That's pretty close to Ray Rice territory. And he just turned 23 and is on arguably the best young offense in football. So, best case you're getting a 23 year old with Ray Rice level production. Worst case, you've completely wasted a pick and get absolutely nothing. It's a big gamble and I think everyone has to weigh the risk/reward. I think at this point, you're crazy if you're counting on him as one of your top 2 or 3 RBs. I couldnt' take him in the first 6-7 rounds when you're hoping to draft reliable starters. But, once you get into the part of the draft where you're drafting RB3s and RB4s, I think he's well worth the risk.