“We had to erase his mind to defeat Bill. It’s all gone.”
The fact Ford is no longer wearing his jacket in these photos has to be symbolic. It means Ford has opened up completely to Dipper and Mabel, and has re-opened to Stanley. Ford no longer has anything to hide from the family, therefore he’s no longer hiding under a jacket while having family moments.
the device is set to erase “stanley” so it makes sense that his memories are easy to recover, because he spends a lot of his time being “stanford”
when we see his mind burning he’s completely alone in the shack, away from everyone, free of his false identity; we’re seeing the pure “stanley” side of his mind, not the “stanford” impersonator we know and love
HIDDEN DEEP WITHIN THE WOODS A BURIED TREASURE WAITS
SECRETS LOST AND STATUES FOUND BEYOND THE RUSTY GATES

