I've heard of two sightings of Cobia the last few months on the Whiskey Wreck(I witnessed neither). I've also seen a decent sized grouper on the Paddlewheeler on two occasions, personally. For both sites, I'm usually carrying a polespear, if anything, so I have shot at the grouper, nor have I personally come across the cobia.
Paulwall witness the cobia at the Whiskey on his trip before last to the area.
The Whiskey Wreck looks great this summer, its supposedly more uncovered than its been since the early '80s. Let me know when you wanna dive it, I'll go, its always fun. Infact, I'll be there Saturday evening, if you'd like to join our group.