Hi,
Sorry about your friend. I was lucky to have my aneursyms found before they ruptured. I had a craniotomy to have one clipped and the other is still untreated. I talk on- line to many others that have aneursyms or have family/friends with aneursyms. Many who have had ruptures. The 6 months after a rupture are critical.
It takes a long time for the brain to heal up compared with other parts of the body. People usely have improvements over a year or two. It's hard to say where things will end up, but he'll probably be disoriented and confused for months.
When they did my surgery they just laid the piece of bone back in place without securing it. This allow it to "float" to adjust to the brain swelling. That area sits crooked and I have a very noticeable dent. Please feel free to send me a private message if you think I can help you with any questions or if you just want to vent. Please give his family my best.
Sarah