We fuss a lot about the bottom of the roster, as we should. However, barring major injuries, I see the 10 players below getting almost all reps for the front 6 (your list plus the next 4). We could add 2-4 more front 6 players, but they won't play much except on ST's. For me, ST's and developmental players are the best use of these roster spots.
THE NEXT FOUR
key backups: Simon, Shelton, Winovich
ST: King
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COMPETING (pick 2-4)
Roberts, Butler, Calhoun, Wise, Parry, Cowart, Kamalu, Rivers, Sam