By Tzvi Machlin Not many Draft Day trades in recent memory have come out of absolutely nowhere the way the Marquise Brown trade last night did. That was apparently by design. Appearing on the Pat McAfee Show, NFL insider Ian Rapoport revealed that the Baltimore Ravens and Arizona Cardinals actively worked to make the deal a secret all the way to the end. He said that the two sides were ready to nix the trade entirely if the move was made public before they were read. “From my understanding if the deal got out beforehand they weren’t gonna do it,” Rapoport said. “Everyone involved kept it secre…