Tough RB situation

I have Kelley and allen starting with Powell in my flex. I also picked up Ivory just in case Fournette doesn’t play. Should I stick with this lineup or change it up?

Waiver wire consist of Forte, smallwood, Collins, lewis, ellington,

Do I pick one of them up to start? If so then who to drop? Powell? Kelley? Obviously I will drop Ivory if Fournette plays but trying to wait until Sunday for a final decision.