But the IPCA ruled there was no conflict of interest.
Det Snr Sgt Croudis (referred to as "Officer A" in authority documents) was interviewed by the authority and hit back at Judge Crosbie's criticisms while making some acknowledgements as to his shortcomings.
"Officer A does not accept the Judge's criticism that he was 'casual' in his approach to the investigation, however he did acknowledge to the authority that there were some aspects of the investigation that he could have done better," Judge Colin Doherty wrote in his recently released statement.
Det Snr Sgt Croudis was also in the gun over his note-making, which he accepted was an issue on occasion.
"The authority finds that there were aspects of Officer A's involvement that did not meet good practice, particularly given his rank and experience, but also concludes that there was no malice or other bad faith on his part," the authority concluded.
The Police conducted an employment investigation into the criticisms expressed by Judge Crosbie, and Det Snr Sgt Croudis received a disciplinary sanction.
It is unconfirmed what the nature of that penalty was.