Want a safe floor flex (.5 ppr)

I was originally going to start Marvin Jones as a high upside play against Atlanta, but with a huge game from Gurley I’m wanting a safer floor for my flex play this week.
My options are:
(A possibly banged up) Rob Kelly vs. Oakland,
Eric Decker vs. Seattle,
Alvin Kamara @ Carolina,
or Chris Carson @ Tennessee.
Should I stick with Jones or roll with one of these guys? Thanks for any input!