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Tight hamstrings can be a significant factor in lumbar disc herniation. Even if it stays confined to his hammies, a 30+ speed guy w/ tightness already and still in Arizona is staring at never being right all year. I don't care if it means injecting his own concentrated platelets, sending a clubhouse attendant to the ID for some Bear spleen or finding his wife's placenta in the back of the freezer, Dyson needs to shut it down and do everything in his power to get RIGHT, before the grind starts. His season hangs in the balance. He'll be nearly worthless if he pops it, and even if he doesn't and is only worried about popping it, a Dyson limited to 75% max effort in the field and on the base paths equals a wasted season .