Mashburn, in addition to
money, has red sweaters, slept with Lisbon (while Jane with Lorelei),
the name that starts with Ma..., he stay in reformatory, had difficult
relationship with his mother, the trauma of his girlfriend with red hair
who left him for Bajoran, his ruthless personality (who wants to have revenge on Yuri
looks like what RJ did with PJ, take away the thing he more loves - for
Yuri the company, for PJ the family - and let live), has helicopter,
plane, the limo, he likes vintage cars, hates psychics, has had several
"wives", the voice may be compatible, he like to interfere in the
investigation, is a friend of all the powerful politicals, attorney and
police chief, has never been beaten by Jane (the only), it's
sarcastic.And he's a bored dandy(remember the Aestheticism:"art and life",
"immorality but beauty" "art's work is the most important thing of the
life"etc).These ideas could be also in RJ, a showman/artist, with powerful friends, money , disciples and, maybe, important secrets on national security, for blackmail other powerful people.
P.S.
"He is Mar/n" write's hypothesis:
He is married (ring)
He is Mashburn (simply, but Heller's style)
He is Marin's (Marin County)