Here’s what I imagined happened in advance of David Letterman’s interview with Ryan Lochte. The notoriously caustic talk show host was told under no certain terms was he to bring up the Olympic medalist’s reputation for being dumb as rocks. He must focus his interview exclusively on Lochte’s accomplishments in the pool and his new TV show, “What Would Ryan Lochte Do?” So that’s what Letterman did. He read through a bunch of the swimming events Lochte won medals in and paused for him to explain what each was. He asked him if he would be participating in the next Olympics — “Where is that again?” “Rio,” Lochte responded with a smile. And later, “When is the next Olympics again?” “2016,” said Lochte. “And it’s 2013 now,” responded Letterman, pushing Lochte to do the math. And bless his heart, Lochte answered every single one of these softball questions correctly. Good job, Ryan!