Well there are rigid AFOs, hinged AFOs, semi-rigid AFOs, flexible AFOs, and all different kinds as people come up with new medical devices. Your problem is that the brace we have seen him wear doesn't look like that.
Notice the two bolts? That means it is this product:
http://www.richiebrace.com/index.php/products/the-richie-brace-restricted-hinge.html
That is a rigid AFO which is what is used for people with a complete palsy causing drop foot.
Even the flexible ones only allow minimal range of motion often in only one direction so for example one could do a heel to toe walking motion but still not drop the foot. The one you are wishcasting would not allow him to angle his foot ~45 degrees so he could land on the balls of his feet.
If he had moved to a less rigid brace that gave less support that would be progress as the change that would precipitate such a thing would be strength returning to the foot to support it at least partially on his own. Only way that happens is if the nerve is firing.
I get the impression that you really have not thought this through and are mindlessly arguing individual points trying to 'win.' You seem to have no concept of the type of injury he has had or what it really did to limit him. Else you wouldn't be attributing flexible AFOs to people with zero dorsiflexion.
Protip: drop foot is not the only reason to wear such braces. There are neurological diseases like MS that cause weakness and partial paralysis that use them. That is opposed to the complete paralysis that Jaylon would have if his nerve has not fired yet.