I'd take a wait and see approach with both backfields. This can be said though, Charles right now seems to be on track to take a larger role in the Chiefs offense than Coffee is with SF. Gore holds so much importance with the 49ers offense than LJ does with KC (or at least he used to). If you think you can afford to wait until tuesday to do it, then wait and see how Coffee does.
But either way, I think Charles will be the more valuable back this year.
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