In my opinion, this interview that George did with OCSD eight (8) days after Casey was arrested and from the day George went to pick up Casey car at the towing company. Everything is still very, very fresh in George's memory.
I feel, this interview is the reason and the only reason George was the only one to meet with the Grand Jury.
It's a little confusing with the dates regarding the gate and the pool ladder, but based on a Greta interview, this gate and ladder issue was either 6/16 or 6/17 not 6/24. It's still to be determined as there was a lot said in this interview on 7/24/08