Sallie Mae’s recently announced plan to split into two publicly traded companies isn’t leaving analysts at ratings services or Wall Street firms with much to cheer about on multiple fronts. In late May, the Sallie Mae board of directors authorized newly appointed CEO John Remondi to press ahead with plans to split the company’s existing businesses into two publicly traded entities – a new education loan management firm, known as NewCo, and a consumer banking company, to be known as Sallie Mae Bank. The board’s stated intention with the move, talked about since at least as early as 2010, is...