You don't know this. We will take a step back because we lose a AA beast in JJ, a very versatile and athletic Nieman, and an extremely underappreciated experienced LB in Bower.
Depth will take a hit anytime you lose the experience of 100+ starts at a position.
You're still fun.
It also takes a hit when you have a coaching staff that is too stupid to get the back ups meaningful snaps in games, and when you have a staff that whiffs on their main targets at that position. There's no excuse for 3 brand new starters at LB with little to no experience. That's on the staff, their lack of ability to recruit, and their stubbornness to not give guys some playing time.