If Walgreens Boots Alliance Inc. is bought by private equity firm Sycamore Partners, it would have more flexibility to "aggressively" reduce costs in order to address persisting industry challenges, according to an industry analyst.  "As a private company, WBA [Walgreens Boots Alliance] would have more flexibility to make major changes to the business, in our view, and aggressively cut costs to try to tackle recent challenges with pharmacy operating margins and declining retail product sales from increased ...