Please help pick 2, Portis, Stewart, Charles

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I am on the fence for picking my RB2 and Flex, I'm starting Michael turner but these 3 have me stumped. Portis and Charles have the easiest matchup but Stewart is on a very run heavy team.

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charles/stewart.


stewart is getting goal-line, and has two TDs in his last two games against NO.
chiefs have a better chance of hanging in against jax than the skins do against the falcons.