The bit in bold is an interesting point you make. As far as I am aware, even with the leaked messages, all Horner keeps on saying is he denies the allegations against him. He has not actually denied the messages are fake, he just keeps on saying he denies the allegations against him. So, if the leaked messages are alleged to be fake, why wouldn't Horner come out and specifically say so? because that's what a person would normally do wouldn't they if they know messages/pics against them are fake, you'd say so wouldn't you?
Horner cannot state if they are real or not I don’t think due to legal implications, don’t forget he was the subject of a legal investigation into an official complaint at his workplace by an external Judge. And as said they will be investigating the leak that’s for sure.
The media spin machine is all over this now, they are claiming Max’s dad wants Horner gone, he is the person instigating it all and apparently he is good friends with the girl involved, but he can’t talk as he seems to have a pretty sordid past too.