Medical reasons why Saints may have passed on RB Tyjae Spears

Would have loved to draft him and would have been first choice for a jersey. But let's be honest, there are like 5 RB's in the league that aren't just interchangeable (Kamara being one of them) and the rest are just guys. Guys whose careers are over after their first major injury. Given that, you need a sure thing if you're drafting one in the first half of the draft.