The issue I have with the date/time stamp on the photo is that I don't know who took that photo and I don't know what time the photo was actually taken. I am not saying the photo has been tampered with, but I have the time on my cell phone set 5 minutes ahead because I'm always late. So the time I take a photo would never be the "real time." I would prefer to believe the time stamps and estimates that all came from the responding officers and their dispatch because I think they are probably all synched. I would imagine they need to be. (For exactly the same issues that we are discussing.)
GZ could have been on the phone, had the pic taken during that time and then immediately got off the phone when the officer came on scene and demanded to know what was going on. Or maybe multiple people were outside at that point and the officer wasn't clear on who to approach. GZ's gun was already holstered so he couldn't have known to just walk up to GZ and put him in cuffs. Questions had to be asked.
An attempt to make a phone call and a pic can all happen in seconds. All before the officer arrived at 19:17 and how ever many seconds before 19:18.
MOO