I'd start Tate and Blount and keep Johnson for the potential shootout with NE.
10 Team QB Flex 1PPR - Week 3
QB: M. Stafford, J. Flacco
RB: C. Johnson, D. Murray, D. Sproles, CJ Spiller, M. Leshoure
WR: J. Jones, E. Decker, A. Brown, P. Garcon, B. Lafell
TE: J. Finley, M. Bennett
K: D. Akers