When Art Modell relocated his franchise to Baltimore, he decided to make it a new beginning. He left the Browns name and history to the city of Cleveland. The Baltimore Ravens for all intents and purposes were a new franchise. They did not claim the history of the Browns to be their own. Ravens history began in 1996.
When Robert Irsay moved the Colts to Indianapolis in 1984, he took everything with him. Baltimore was devastated. The one thing that did not sneak away in the middle of the night with the Mayflower trucks, was the Baltimore Colts Marching Band.