Notice the top answer entry for some? Notice the fewer deletions? It's the editor in chief..not the votes from the ....does this look like...?
Answers

As far as I know, it's only the top level posts that are in contention for top answer status, posts hanging off those posts aren't a factor, even if they garner more votes than the post they're responding to.
Also keep in mind, it's first past the post. If you see two top level answers with the same number of votes, it's the answer that got that number first that gets to be "top answer", if the other answer were to get one more vote, then it would become the new "top answer".
