so I did a quick lookup of the Alabama defense from 2017 to 2018 to see if there is anything indicating a reason for him being dismissed after one year at 'Bama and under a coach that was also his coach in college for his senior season. It is rare for anyone to be dismissed after one year based on performance unless it was glaringly poor and attributable to his coaching. Below indicates overall defense was worse than the prior year at Alabama - but not so bad as to indicate the DL coach would need to be fired. (can't figure out how to get the numbers lined up. Must have to copy and paste)
2017 2018
Points Allowed (per game) 11.9 18.1
Rushing yds allowed (net) 94.7 121.3
Rushing per attempt (net) 2.72 3.53
Passing yds per game 165.7 200.7
Sacks 27 15
3rd down conversions 34.6% 34.2%
The defensive coordinator at Alabama in 2017 was Jeremy Pruitt - who left in December 2017 to become the head coach at Tennessee. He would not have coached Kuligowski. The DC at Alabama in 2018 was Tosh Lupoi - he would have been there when Kuligowski was the defensive line coach. He left in January 2019 to become the defensive line coach for the Browns... Kuligowski was an associate head coach and the defensive line coach in 2018, not small responsibilities. He was the only associate head coach listed for 2018.
The defense was worse, but not that much worse. Could have been a factor in why the DC left - but doesn't seem to explain why Kuligowski would have been let go. The d-line lost 3 guys from 2017 - 2 went to the NFL (one early and the the other after graduation) The 3rd was a top back-up at 'Bama but did not make a roster in the NFL for very long.
Could be a number of things that ended up in losing his job. Stats don't seem to indicate the results were so bad that an immediate change needed to be made, but rapid personnel changes generally involve something other than performance issues. Can get "sideways" with someone that can impact your employment. Personality rubs with people having huge egos can also be dangerous to your career. Too many possibilities and will likely never come out since a severance was paid - which generally always include the stipulation that the terms or causes for the separation of employment cannot be discussed.
Did find the article linked below that does not say a whole lot other than Kuligowski was not expected to return after 1 year at Alabama. They obviously have a lot of money to throw at football and the coaching staff there. Paying nearly $1M in severance to a guy that was there for one year and had a very good reputation and record of success (and they paid a paltry $53K to get him out of his contract at Miami) seems crazy in the world of mid-majors.
https://www.saturdaydownsouth.com/alabam...to-return/