Of course he testified. He gave a half dozen statements to the police. They are all in evidence.
Everything you say can be used against you and likewise everything you say can be used in your favor.
“...likewise everything you say can be used in your favor.”
That is 100% untrue.
Was he ever sworn in in court! Anything you say prior can be misconstrued due to some glitch!
Did he ever Say I solemnly swear this is the truth and nothing but the truth!
I believe so help me god has been deleted!
Only if the prosecutor is a moron.
An attorney may in general only ask someone about something another person said if the person being asked about will be available to the opposing party for cross-examination. For the defense to introduce testimony about things GZ said, it would have to agree to let the prosecution subject GZ to cross-examination by the prosecution. Conversely, the fact that the prosecution asks people what GZ said would mean the defense had the right to call GZ; since the defense already has the right to call GZ, however, the latter point doesn't really matter.