The Ravens signed an accomplished African-American quarterback who has been out of football for an extended period to join their roster last week.But if you thought that signal caller’s name was Colin Kaepernick, you don’t pass go, and you don’t collect $200.Instead of bringing in Kaepernick, the man who led the San Francisco 49ers to within a whisper of beating the Ravens in Super Bowl 47, the Baltimore brain trust instead signed Robert Griffin III.