Well, I think it's safe to say that he won't be an Oiler next year. We just haven't seen enough development out of him. Seriously better off with Jones playing on the right despite being lefthanded.
While I don't like the player overall, and certainly agree with the statement he hasn't developed, the rest of your post is bad.
Benning has shown more in the 2016-2017 season than Jones ever has. Benning regressed since then but still is a "relatively" consistent bottom 3 defender.
It's kinda like Caguillia. I didn't like the player but moving him without someone to at least replace him is foolish.
You can't trade/drop Benning and just hope Jones or someone else will be as good or better.
Bring everyone to camp and if someone clearly is better than Benning keep Benning as the #7 guy until it makes sense to move him. Especially with how injury prone our defense is it doesn't make sense to move him for nothing.
Benning doesn't thrive in a top 3 role at all but Jones completely fell apart when he was in that position.
Having said all that, with how awesome our defense prospect pool is you would think Benning shouldn't last the entire season as an Oiler and really should not be needed the following year.