Except for much of his career AI was listed as simply a guard. On most bio pages, he's now listed as a "guard" - which I think is the more accurate. Much like Arenas.
I've said quite a bit during this process (well... the one I've been involved in at Hoops Manifesto) that I don't believe that players fit into the parameters we paint any more. The notion of "PG-through-to-center" is something that's been in place for decades... but I think that players over the last decade have been far more flexible than that.
http://with-malice.com/ - The half-crazed ramblings of a Lakers fanatic in Japan