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One difference in Seager's favor: Watch Seager's home run trot. He's as light on his feet as Legolas walking on top of the snow. He just floats around the bases.
Go check it out. It's fun to watch him run: he looks like he's running in 0.8 gravity.
(This, along with vertical jump, is what NFL combines assess when trying to assess pure overall athleticism.)
Snelling ran heavily. Maybe this will be a difference as far as the DL.