Only time will tell if Kollie ought to play more. For me, given all the hype, Liufau may be the most overhyped player on the team. He seems like a small but faster Bauer which means we have two guys running around like chickens with the heads cut off rather than making plays.
You're a bit off when it comes to safety blitzs. College teams run them all the time. The problem this defense has is they are telegraphed way too often.