Hi Machka,
The staff at the hospital have probably already told you this. Communication is so important. As a person goes into and comes out of a coma, hearing is often the last sense to go and first to come back. Talk to Rowan always as if he is awake. Chat about friends, the news, cycling, whatever. Have friends & family visit. Bring in his favorite music to play. Always hold his hand, touch his face, etc.
I firmly believed these things helped me come back from my coma after a race car accident in the Seventies when the technology wasn’t nearly as advanced as it is today. I was lucky enough to stage a full recovery and even go back to racing cars, much to the disappointment of my dear Mother!
It sounds like all is moving in the right direction. There are no guarantees but there is always hope. Hang in there.