Not much experience. Has only coached defensive backs.
The Packers are coming up on a window where they can be legitimate Super Bowl contenders. We don't need a DC that is learning on the job.
Maybe he will be a good DC....4-5 years from now.
I understand the criticism that he lacks experience.
However, it's not true that good DC's necessarily need a long runway for development. It certainly can happen that way, but there are a lot of examples of guys being good immediately (examples below). I would actually argue that if a guy needs 4+ seasons to get it figured out, he probably isn't ever going to be good (but I haven't done all of the research to be definitive about that).
-Mike Macdonald (2022-- #3 scoring defense)
-Brandon Staley (2020-- #1 scoring defense)
-DeMeco Ryans (2021-- #12 scoring defense)
-Dan Quinn (2013-- #1 scoring defense)
-Vic Fangio (1995-- #7 scoring defense)
-Todd Bowles (2013-- #7 scoring defense)
-Matt Eberflus (2018-- #10 scoring defense)
I have no idea if Parker would be the kind of guy to succeed immediately. He may need a season or he may not. But history would say that his lack of experience in no way dooms him to mediocrity.