Thanks for the feedback! Ellison would certainly have been included were he still CEO of Oracle (He stepped down a year ago and is now Executive Chairman and CTO). We considered Weiner and Mollenkopf (as well as some others such as Marc Benioff and current Oracle co-CEO Mark Hurd), but decided to limit the number of options presented to respondents, as too many choices can sometimes hurt response rate.
Yeah, I figured out that since it was a survey, limiting the options to the most famous names was more of a necessity.
IMHO I suggest you run a future survey asking about the most important qualities that a candidate should possess, just to cross validate the answers.