My gelding had a very similar injury last summer. He and my mare are both stalled next to each other, and they both get excited when it's feeding time. Well my mare Belle, likes to make a lot of racket to let you know that she doesn't want to be forgotten, so she likes to kick her feeder.
Bingley decided he had had enough of her none sense and kicked back at her. Well when he kicked her, his foot went through the wire fence and got caught. He managed to free himself, but it resulted in him getting two nasty cuts to both sides of his pastern. I called the vet, luckily he didn't cut into any arteries or ligiments. Just required bandage changing every couple of days to keep it clean. Didn't cause any deformities in his hoof and he doesn't have any soundness issues.
Your boy's foot looks like its healing beautifully! Keep up the good work! I had a little trouble with proud flesh, so considering you don't have any is a great sign. The swelling will go down in time, just takes a while. Poor Cinny, it's no fun having to stay on stall rest! Get well soon!