Apologies if so, but I don't quite agree. I am reading the thread again, the other person didn't come into it until a bit later. The third quote could apply to either, it's hard to make exact sense of the message. Definitely the two others seem to refer to Mr. Abbott.
Regardless I am sure that if your son practices chanbara and the seminar is about chanbara, it will be a good time (at least I sure hope so).