Overall, Humana's focused chronic care management platform for seniors is "driving the all-important competitive medical cost advantage," the analysts said, while the benefits of a lower corporate tax rate are offering the insurer opportunities to invest in further growth. Humana's executives are not the only ones to find themselves on the defensive about the disruptive forces in the industry. On Cigna's quarterly earnings call, CEO David Cordani fielded questions about the Amazon-Berkshire Hathaway-JPMorgan Chase venture, saying he views the push toward greater value in healthcare as a positive.