Will his she’ll ever regrow scutes.
It IS fully healed. What you see is new keratin, new shell. It will never look like the old shell because the old shell put on new growth a bit at a time, making the scute pattern. Because of the overall injury, this new growth happened all at once, over time, so no scute pattern. Scutes are keratin. The new growth on this tortoise is keratin. Same thing, just a different appearance.