a) Is willing to at least tell the UK government that he's Keisuke Harigai (see this UK trademark registration: https://trademarks.ipo.gov.uk/ipo-tmcase/page/Results/1/UK00... )
b) Is comfortable with registering companies in shady tax havens and knows his way around international IP registration/enforcement
c) Has a bunch of private data related to Cookie's Bustle's development
d) Is unwilling to make any sort of public statement beyond sending takedown notices
Meanwhile, Keisuke Harigai:
a) Is Keisuke Harigai
b) Runs a company out of the Cayman Islands
c) Would have access to all data related to Cookie's Bustle's development because he ran Rodik
d) Has not made any sort of statement related to Cookie's Bustle since 2001 ( https://web.archive.org/web/20010725131942/http://www.idevga... ) despite people attempting to contact him after the takedowns started
Obviously nothing concrete but I think he's the likeliest candidate.