Michael Penix Jr may be enjoying the most relaxing NFL introduction of any other rookie quarterback. After all, no one is expecting him to replace Kirk Cousins as the Falcons QB1. In fact, Penix needs only to learn the Falcons playbook and watch the 35-year-old Cousins. Both are new to Atlanta, but Penix is the rookie while Cousins is entering his 13th season in the NFL. “I think it’s been fun to watch him learn from Kirk,” said Falcons coach Raheem Morris earlier this month. “I think the cool part is him being in the background, being able to process, watching Kirk go through his way of doing…