Stable basically mains condition unchanged.
So stable but critical, means his brain is still bruised, they have him in a coma until the body starts the healing process, and they are going to keep him that way until swelling subsides.
Then they will consider options.
Induced coma, means a machine is breathing for him, so barring infections he is 'stable'.
The slight improvements they speak of likely relates to the swelling subsiding to some degree.
Rather than any action by Michael.
The man is in trouble, anyone with such an injury is, only time will tell how much.