So what? It´s a criminal case, not civil. Nick has nothing to do with it.
Let me try in baby speak.
Accuser: Kayla is the damaged party because of whom the state is bringing the charges
Witnesses: Nick, April, Geno, Keanu
"Hacking Case" accusation: Nick, April, Kayla, Melton (and possibly others) either had direct access to Aaron's Google, Social Media and YouTube account, which contained confidential communication between Aaron and his lawyer about the defense in the Revenge Porn case.
It is further possible that the confirmation of "a message was sent by Aaron to Geno at the time and date matching the livestream", was also only possible because April had illegal access to Aaron's mobile phone records after or during the divorce.
It is also possible Geno and Keanu were told about the information Nick had access to illegally.
All of the above directly tie into this Revenge Porn case and compromise due process. That is why the results of that investigation are relevant.
If it can be proven the witnesses and victim in the RP case were reading Aaron's communication with the lawyer I expect the case to be dismissed.