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Many, many, many health organizations seem to disagree with you that a disc herniation can be an early sign of disc degeneration. A herniated disc commonly can be an early sign of disc degeneration is something stated by numerous major health groups. I can drop some links to reference if you'd like? Age is irrelevant to what I'm talking about, especially when it comes to athletes, who expose themselves to greater risk of chronic injury based upon the nature of what they do.
Never said it was a guarantee, so I should have clarified that it "can be" a sign.
It's still enough to scare me off from drafting an 18 year old that has a higher risk of back injury shortening his career. At least with the #2 overall. At #18 I'd probably take him, but I wouldn't dream of it at #2.