They were signed by the Dolphins and will be at mini-camp...
According to a former teammate of Bigby's, Saban liked him, a few days after I was told this information...he was signed.
Huggins was signed a few days after the draft and Atari Bigby worked out with dozens of other unsigned free agents for a contract with the team and was signed a few weeks later.
Even though Atari Bigby was signed much later than Luther Huggins, my gut feeling is that Bigby has a much better shot at making the final roster than Huggins, simply because the Wide receiver position is much deeper then the safety position.