Ryan Tannehill was often a punchline during his years with the Miami Dolphins. Since joining the Tenne see Titans, though, he's far from that instead, he's a sleeper in the 2020 NFL MVP conversation.There's not just one reason that Tannehill has gone from mediocre to a star with a big contract. He didn't make major mechanical changes once joining the Titans. He didn't escape some awful injury...