After MannKind Corp.’s only product was dropped Tuesday by the company that was marketing it, execs said the Valencia company was not running out of cash nor was the company for sale, the Los Angeles Times reports. Still, the news was a rare but big setback for the company’s founder, Alfred Mann, 90, whose personal investment of nearly $1 billion in MannKind now appears in danger. Some investors think there’s no silver lining and, like the writer of a post on Seeking Alpha, believe MannKind is circling the drain.