Brumby
Major
Doubtful there were Chinese military personnel on board the specific fishing boats you mentioned, because I Japanese officials would play the political angle to the hilt. I don't discount the notion China would station military or intelligence agents on board "fishing" boats for better coordination with the CCG and the PLAN, but it probably didn't happen with the Japanese incident of 2010. Still, if you have "multiple sources," kindly list them for future reference.
I will PM you on my reference source.