My brief thoughts...DLine talent is diminished since we lost Big Cat, Goode and now possibly TMB? Adding Hunter isn't nearly enough to replace losing those 3 guys. LB talent is significantly diminished as we lost our leading tackler and best LB (by far). The new LB's could help but I haven't seen them play yet. DB/S are the same guys so talent is equivalent (experience should help but we'll see). And remember, we also lost our third leading tackler (Armstrong). So, we lost our 1st, 3rd and 6th leading tacklers. It's a game of tackling and losing half of our top 6 will have an impact. All in all, talent is a question mark on the D.
Quality assessment here, and I would add the biggest loss in the front seven is Kalia Davis. I re-watched the first possession of the Boise State game and Davis was dominant. He was so much quicker off the ball than every other defensive linemen. He has a bright future in the NFL. Losing future NFL players like Davis and Bryant as well as defensive stalwarts like Buthune, Gilyard, Goode, and possibly Tre'Mon Morris-Brash leaves a sting. UCF's defense looked like swiss cheese at times and a Chinese fire drill at others during the spring game.
Last year, the defensive line was the difference in a lot of wins. There's new faces all over now.