They are two of Central Florida's biggest and best-known employers -- and both face the prospect of potentially ugly lawsuits stemming from a worker's death on the job. And yet Walt Disney World, which is being sued by the mother of a monorail driver killed in a train collision in July 2009, and SeaWorld Orlando, which is bracing for a similar suit from the husband of a killer-whale trainer drowned by an orca last February, are well insulated.