Daune, the limo driver, the other witness, Trevor, etc. were all only mentioned in support of the claim that the detective perhaps did not fully investigate this case properly, overlooking several possible witnesses and their potential place in the bigger puzzle.
None of the defence lawyers (so far), entered evidence pointing to the fact that any of those mentioned names committed the crime. It was more like, ''Maybe reasonable doubt could exist, the detective didn't investigate all possible people, instead he chose to focus solely on one person as a suspect"
None of those names were just thrown in randomly, in my view. Daune was backed up by the claims about Trevor acknowledging that he was not alone that night (whether they verify this with Trevor in court is another story). They showed the security footage of the limo driver. They asked the detective how come he did not interview the other witness (this was the dude in front of the the police car while Naz was inside), and they asked whether or not Trevor raised any suspicion or was just a witness.