Medical reasons why Saints may have passed on RB Tyjae Spears

Spears has looked really good almost all year, he did seem to tire some this past week with all the featured usage after Henry went down...but was also getting drilled behind the line of scrimmage often.
Miller is still a big mystery box and I am not close to writing him off.
That said if we are going by a snap-shot of value, Spears looks like the better player and quite likely the better pick. Good for him.