Considering its the IRI, I wouldn’t be surprised if they wanted to permanently get rid of one or 2 of the sailors and the others were just collateral damage.
According to https://www.tehrantimes.com/news/428754/Bodies-of-Iranians-from-Nazmehr-ship-still-in-Baku-embassy : Medical examination of the bodies of Akbar Mansumi Kerim (1989), Seyid Murtuz Mirhuseyn (1986), and Sadzhad Sayad Feriydundur (1990) is underway.
Have you seen any other info about them?