Bit puzzled on this one. This comes just a day or so after the news that Dalton Botts officially switched to Miami. This was an expected move, as many thought he was a back-up option in case Brad Wing didn't get eligible.
Many, including myself, thought Botts would go elsewhere freeing up a scholarship for a different position, but Miles and co. obviously felt getting a kicker was important.
I don't know much about Hairston as a kicker, and this is by no means a shot on his abilities, but this is a puzzling offer/commitment to say the least.