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Hynes can kick off one boot pretty reasonable, but from what ive seen thats the only boot he ever kicks off, even when pinned on the wrong side of the field. You want a fullback to be able to kick off both boots comfortably.
JOC could play fullback, its a pretty demanding spot to make a debut in since you are so isolated from the rest of the players, but i suppose any position is hard to debut in.