A Las Vegas gambler has added Paramount Skydance and Larry and David Ellison to his lawsuit against executive Jeff Shell , escalating a dispute over purported off-the-books PR services. R.J. Cipriani sued Shell, the president of Paramount, last week, claiming he is owed $150 million for services performed under an unwritten contract for crisis communications services. Shell fired back on Monday , accusing Cipriani of defamation and extortion and of seeking to exploit their fleeting association