For me I think we have great defenders and a defensive minded coach already in place.
What we need is more balance.... A great scorer/offensive player.
The warriors have really good defenders (draymond, bogut, etc) and really good scorers (curry, Thompson) and not all those guys are good on both ends of the court.
Same with the spurs. Aldridge isn't much of a defender. Neither is ginobli or parker. They are there to score.
Not all players can be like Leonard and cp3 and be really good on both ends.
The jazz already have Gobert, favors, and exum. Stud, terrific defenders. What the jazz do not have is a dude who can drop 40-50 points in a game a few times a year and frequently hit the 30 point mark.
That's what the jazz should be chasing right now. Give up hayward, Burks, trey, draft picks for a dude that can score like that.
Or trade for a high draft pick if there might be a dude like that in the draft.
Of course there is a good chance that there simply isn't the opportunity to trade for, draft, or acquire in free agency a guy like that.