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Well then please take a look at https://steemd.com/gaming/@steemcollator/guess-the-word-and-win-steem-game-51-results-and-game-52-2017-08-07
It clearly shows how a few people have more than one answers and someone has even changed their answer just 30 minutes ago. All of those answers happened 2 days after the contest was posted, ideally making their answers void. Yet, they have still won.

You can change your answer during the 2- 3 days period but you can't have 2 answers at the same time

I don't think you've clicked the link. But @lindo has two answers for this game. His second answer was posted 30 minutes before this post. Even if many answers were allowed, his second answer was too late and the first five people should have received rewards instead.