I read through some of the news information again to see whether we can get some general direction he might have moved in from the reported sightings. It looks like the reporting evolved from SW 9th and Arizona, to SW 8th, SW 9th and Cornwall and eventually to SW8th, 9th, Washington Avenue and Cornwall after police was able to work through available camera footage.
The way it is stated it does sound like sighting of him were reported but as mentioned above I agree that it would be helpful if police would clarify this.
July 28th 2021 Media Idaho News:
"Idaho State Police issued an Endangered Missing Person Alert for Michael Joseph Vaughan, who was last seen in the area of
SW 9th and Arizona in Fruitland on Tuesday."
Source
August 17th 2021 Media KTVB mentioned he was last seen
"He was last seen in the area of
southwest 8th Street, southwest 9th Street and Cornwall Way between 6:30 and 7:15 p.m. on July 27 in Fruitland."
Source
October 8th 2021 Media NewsNationNow: (This was after police was looking through available video footage)
"He was last seen in Fruitland, ID in the area of
SW 8th and 9th streets, and Washington Avenue and Cornwall Way between 6 and 7 p.m. on July 27."
Source
I hope I labeled the Splash Pad Park correctly on this map. His mom mentioned in The Lauren Matthias / Hidden True Crime podcast that he has attempted once in the past to walk towards the park by himself and was caught by grandpa who drove by and saw him. So considering the reported sightings/locations I would say there is a possibility he was on his way towards the park. I also want to add that the picture of the Honda Pilot can be confusing due to camera angle but this vehicle is leaving the area not driving in. At some point this vehicle entered the neighborhood and I assume that police knows how much time was spent in the area. The Honda is driving out of the area right across from the park on this picture.
I wonder whether locals are aware to look for blue flip flops size 11? Kids lose shoes all the time and someone might not realize the importance of such a flip flop found in the area if they are unaware. His mother mentioned in the above mentioned podcast that she had just purchased him these flip flops and he was still learning how to walk in them.