I think you stay with what you have. Murray does not look great right now. He has not had a great game yet.
I would just wait on this.
10-team keeper league - QB, 2 RB, 2 WR, TE, FLEX, D/ST, K
QB - Newton, Palmer
RB - R. Matthews, Martin, Stewart, F. Jones, B. Brown
WR - Julio, Austin, Maclin, Heyward-Bey, Amendola, D. Alexander
TE - Graham
D/ST - Bears
K - Tynes