To be fair, in the first five games Jones had six tackles for loss and seven QB hits including five sacks, all while playing less than 50% of the snaps. He WAS doing exactly what they wanted from him. I'm not surprised it was going to take more than two games for them to give Turner his reps.
And, while I'd switch to Turner now, I wouldn't be surprised if they give Jones more rope. He was one of the things that was working early.
Really, I think missing Cashman is a bigger deal than we thought. I don't know how to look for the stats, but the best part about Greenard, Van Ginkel and Jones was that they could drop back into coverage OR blitz. Clearly, Pace has no business being on the field in coverage situations and I'd guess those guys are picking up some of the slack.