I came across this post on Gab, with this picture
The Nashville shooter's shoes changed.
I decided to check the video myself. On this school surveillance video, at 1:32, you can clearly see the shooter wearing one type of shoes. On this police bodycam footage video, at 5:57, the shooter is clearly wearing a different pair of shoes.
Possible false flag.
Thanks for the extra screenshots. I still think they're different shoes, but you're right, the white square and shadow below it (especially in the 2nd pic) looks fake and manipulated.
Exactly man, I just made a full post about this to get more attention on it also:
https://conspiracies.win/p/16amYf6gl9/