Full disclosure, I really liked Jones so there is a bias for me, in terms of my opinions on him.
So, what difference does attitude make at CB? How important is it, in terms of scheme? Well, it's the difference between your DC having a job or getting fired and winning or picking top 10.
It is a very risky business to "project" a players attitude, his aggressive traits, in accordance with scheme fit. The team didn't like the way Jones produced TOs. He was a very solid CB who played good coverage but he didn't create TOs and he wasn't very aggressive in Coverage. He played hip pocket, always in good position to make the tackle, so to speak. He was not really a Ball Hawk. Very iffy business to try and project that type of aggressive play to a player that hasn't really shown it in his play. I mean, it could happen but there is no guarantee it will. If you want that kind of player, draft that guy who has shown that this is how he plays.
So what do you want, coverage guy or Physical Press guy?