I own Jones in two leagues, one of which is a dynasty league.
His value to his owner in the dynasty league is way more than I'd consider worthwhile. To get him, it would take another young starting RB, so why bother?
In the redraft league, I got Jones in the 5th and wasn't going to take Benson unless he fell to the 9th. He didn't. I wouldn't consider trading anyone I current have penciled in as a starter to get him. If I have a bench player good enough that he'd start for the other team, I'd probably offer that player, or maybe a little more, but it won't be enough. People who own Benson believe he'll be the starter sometime this year, and that's the kind of value they want in return - that's not worth doing, at least not to me.
I'm perfectly content having Jones with no Benson, because I don't believe Benson will be the starter this year unless Jones gets injured, is ineffective, or the Bears fall out of the race. I expect Benson to get around 8 -12 carries per game with Jones getting around 18-20 carries and a few receptions.