Foreman, Lynch or burkhead? IR spot help

I currently have Donta Foreman on my IR spot, but now lynch is injured. Should i put lynch there? The things i read about lynch say that he might have a chance to comeback after the 8 games, but the raiders will be possibly the worst team in the league by the time we get to the end of the season. Foreman news arent the greatest as well, he’s not healed yet to come out of the PUP.
My other option would be to just drop both of them and pick up burkhead to my IR spot.
Any tips?