>>56177711After more careful research, I decided to do another experiment with another area. I wanted a specific stop to become a gym because the location would benefit the most amount of people in that area, so I upvoted that stop and waited several days. It was the only stop with an upvote in the area. Today when I administered the final stop to create the gym, the desired stop did indeed become the gym, which makes the time-sync theory seem correct. Another reason why I think this is because in another area where I tried to make a second specific gym I upvoted my desired stop but then added the final stop right afterward, which was about a day. The second gym went to a different stop that I never upvoted, due to the game not syncing the upvote in time apparently, and the gym priority went to the oldest stop in the area, which sparks another theory of gym creation. Perhaps if there are no extra photos or upvotes in an area, the oldest stop automatically becomes the gym.
After carefully evaluating this experiment, it seems my desired second gym is good to go, but I’m just going to be extra careful and get another upvote to the stop and wait several days for another sync before doing anything.