Interestingly enough, he did better in the global survey than the US.
Another puzzling point are the dates of the survey. The survey began in January 2005. But I hardly think Disney would have been inquiring about Zac at that time, since really he had no worldwide recognition until the airing of HSM1 in January 2006. I don't know how these things work but that seems relevant somehow.
Anyway. I wonder what picture they should the survey-takers...
Apparently in the next J-14 issue there will be a few pages on 17 Again and a Miley fan posted several images from the magazine that have Zac, including this one:
Hopefully, in the next few days scans of the actual article will surface.
ETA: This is a scan of the page about Vanessa's competition and how Miley is bff with Zac now... lol.