The survey is flawed without the options to be a bottom/top/vers and stay the same.
The survey was meant for those men who started as one category but through trial, error, and the passage of time, felt more comfortable in a different role.
For those who's sexual role preference has never changed, those guys are more than welcome to declare their non-changing roles in the comments section.
For those who's sexual role preference has changed, it would be interesting to find out what event/criteria led them to switch from one position to another.
Of the 23 respondents so far, it appears that those who started off as Tops are more likely to switch roles than those who started off as either Bottoms or Versatiles.
Sorry for not making the intent of this survey more clear in my original post.