Sitting in a restaurant with a friend who works for JJP and showing him this thread.
His two cents: probably the shortest training of all the Japanese companies for rated, expat DEC-s. No expat FO-s have been upgraded, yet. Some are in the works but the results are yet to be seen.
No airframes on the ground, however flights have been cancelled during busy seasons due to lack of crew - it is already included in the 83% of OTP for the last year or so.
Failure rate of the usual suspects is high due to the "...but in my previous company..." attitude. Guys who are humble and understanding towards the sensitivities of the Japanese culture combined with a great attitude didn't have problems passing.