<p>The bounty should go to whomever you award it to.  If you don't award it on time, it should go to the answer that accrued the most upvotes during the bounty period.</p>
<p><strong>Update:</strong>  <a href="https://math.meta.stackexchange.com/questions/19282/bounty-on-a-community-wiki-question-what-will-happen">The earned reputation will go to the person who initiated the awarded answer</a>, even if others edited the answer subsequently to improve it.  You would not be able to award points to an editor, even if they added the bulk of the value.</p>
