I like Austin for the reasons you stated, and based on the matchup. Seattle is a lot worse against the pass than the run, and Dallas is going to be looking to bounce back big time after last week, so I see some big play potential out of Miles.
The Patriots also have a good run matchup, but there is too much sharing going on in the backfield to make me confident Law Firm will get enough looks.
KC's matchup is ok, but Miami isn't terrible against the run, and I see Battle having an average but not big game.
Battle may be a safer bet, but I think you have a better chance of big points w/ Austin.
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