Aaron Rodgers remains a free agent at this point in the NFL offseason. Despite many reports about him likely signing with the Pittsburgh Steelers, Rodgers has remained non-committal and still has his freedom.

Late May is approaching, all 32 NFL teams are preparing for mandatory spring practice, and Aaron Rodgers remains unsigned, a month after declaring he's "not attached to anything" regarding his football future.

As to what that sign might be, or at least the reason behind the delay, the author who wrote a biography of Rodgers— Out of the Darkness: The Mystery of Aaron Rodgers —has weighed in on the matter.