It does make sense to deal him, but now isn’t the time. They would get more value just before the draft or even just before the regular season. The free agent back market is wide open now. Right before the regular season some desperate team with an injured back might give more, or maybe the Bears would have injuries in camp and need to keep him.
I think they need to keep him until the week before the season starts. Someone gets hurt and peo0le don't mind giving up a third or fourth round guy a year from the draft