I expect Clark and Lowery to make strides. Bigger for Clark, but Lowery will be a pretty good rotation guy I think starting this season. I expect Randall or Rollins to take a big step. It's certainly possible for both, i think Randall needs to be coached more than anything or move his position to where he can play the ball and not the man, but either way he needs to play within the system and not get lazy and do what he wants.
I see no reason why Martinez won't improve. He was doing well and was learning from the mistakes he did make while taking on a huge role in the defense as a rookie. He's physically capable, and he's shown he is intelligent and likes the work. I bet on those guys improving. Fackerell I think will be just a situational rusher. He lacks size to hold up, i think , down after down, but he is long and has good leverage. He's going to be that edge guy that can get to a spot and bend to gain leverage and get to the QB. I don't see him being a huge part of this defense, but he was coming along and then was out with injury. a year of NFL experience can do wonders. I'm not sure where is improvement will be on a scale. I'm not expecting world beater in year 2, but I can see situational benefits for him.
I was excited by Elliot early, but that has waned over the past season or 2. He's had time to take off if he was going to, so he's going to be about what we've seen. I'm not expecting more. Just a situational guy. Not great, but not terrible either.
I do think Brice will be more involved too.