Good morning Debbie,
Boy this is a rough road and tough call for the staff when someone is found so late in the process of an event.
I am happy you have him and he woke up

. It doesn't always go that way. I hope he is able to accept what has happened and work in PT to get the most back. Often with a right sided stroke there is speech involvement and it takes a long time to talk again.
Embarrassment of how he will sound will be in the play. We tell patients to talk to the TV...(just him and the TV there) it is practice....also singing is a different area of the the brain process so what words can't come out in word can come out in song. Weird I know but it works.
Learning to write with the left hand its another challenge and eating with one hand.....if he is strong willed, don't take the frustrations personally. They lash out to the loved ones (they know you won't leave them) This is big.
God stopped him in his tracks and he has alot to go through. As we had to accept the NEW US, so does he. Some never get there....also you have the heart issues to deal with too.
I am so sorry for you as he is so young, but with love around him anything is possible.
My BIL is similar and there are all degrees...but he can't read either. It is called aphasia when you can't speak and there is expressive and then there is receptive aphasia...(expressive is talking and receptive is the input) where TV and reading are jumbled as well...you see the objects but you can't make sense of them. Even reading a clock is not right. Number are there but what do they mean?
Hope it is a good rehab facility. Presence of family there also helps the care (they know people are watching).
My heart goes out to you. If I can do anything or help you in any way, let me know. Nancy B