Ex-Marsh Executives Bolster Small Rival  NEW YORK (Reuters) - The scandal at Marsh   McLennan Cos.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MMC.N target=/stocks/quickinfo/fullquote"&gt;MMC.N&lt;/A&gt; may have floored Wall Street, but some executives who  had defected to a rival insurance broker said the legal storm  was long overdue.