This weekend, the Pro Football Hall of Fame will prepare to welcome the Class of 2022, which includes headliners like former Packers safety Leroy Butler and Jaguars tackle Tony Boselli. The annual Hall of Fame Game was the first step in that process. On Friday night, as legends already enshrined in Canton descended on the Hall to welcome their all-time peers, one former superstar seemed like he had the time of his life — Chiefs Hall of Famer Bobby Bell. A cornerstone for Kansas City in the 1960s and early 1970s, Bell found a piano to play on while hanging…