Azawakh really don't have roaching. Many have high slung fila butts and many are flat backed. I think what makes Joey's legs seem long is that he's shorter in the loin than the standard calls for. Also, his head is on the opposite end of the extreme from what azawakh would have contributed.
I agree with this, at least regarding the Azwakh comments. I've been fortunate enough to meet and interact with several (THANK YOU UKC!) and if Joey had Azawakh in him, I'd probably ask around to see if someone had slipped something in my drink.
I do see Podengo in his face. (I've been lucky enough to spend a lot of time with all three sizes of Podengos as well - again THANK YOU UKC!) and if he has anything in him other than Ibizan.... I'd put my money on Podengo.
BUT - from the admittedly limited knowledge I have of the history of Podengos in the United States, I'd be skeptical that a medio or grande got into "the wrong hands" in the first place. The Podengo people I know are insanely protective of their breed - much like the Ibizan folks - so I just don't easily see one ending up in a situation where it would be purposefully bred to an Ibizan.
Granted, all the Podengo/Ibizan people I know are in the northern half of the country - I don't know anyone down in the Florida area. *shrug*
Now, I am hesitant to tell the Ibizan people that they don't know their own breed. Heck, when people who are not in my breed try to tell me they know Dobermans better than I do... I feel a bit insulted! So I'm not touching that with a 10ft pole.
Bottom line.... if AKC accepts him as a purebred Ibizan, he'll have a fun time coursing and I wish you all the best. If AKC won't accept him as a purebred Ibizan.... don't worry, come hang out with us CAT people. We're a fun bunch, even if some people don't want us around.