I wonder why he was removed. Could it have to do with his upcoming trial? Or potentially incriminating himself for possible further charges against him? I do think he has an attorney now.
I'm thinking that the ADA doesn't want JH cross-examined by defense.
From watching the trial of Michael McCarthy for the murder of Bella Bond, I learned that to put in a piece of evidence a person has to take the stand, so the original plan was likely to be to call JH to the stand, introduce the messages with EG's intent to smoke and go to EG and have the ADA read out EG's side of the conversation while JH reads out his own side of the conversation. But if the prosecution put JH on the stand, then the defense gets the right to cross-examine. The whole thing puts JH in an awkward position, he's been publicly been playing the "I'll support EG if she's innocent" card but he's also removed all her photos from his FB and there's now JO saying that JH admitted to her that he thought EG was guilty.
So, the ADA can just use a police officer to go through those messages between EG and JH, and introduce the messages to evidence that way. It makes things a lot simpler.
That's just my conjecture about the reasoning and how they'll get around it, I could be wrong, but I think it's fair conjecture.