He does look a little better! No meow because he most likely meowed himself raw when he was sick, or he is still too weak. A proper meow will be another milestone. That grinding would be something to have checked out by the vet the next time he is in, you could video it and bring it to the vet too. It usually means jaw/tooth problems but at his age I doubt it. It may indicate he is still just to weak to even chew properly, see if thinning his food would help a little and it would get more water in his diet too. I had a cat that lived to sixteen who did it all his life, so after checking it out it would make you feel better to know nothing physical is wrong. Good job! He is looking so much better!