The current requirement for proposing a tag synonym is five score in that tag. Would it make sense to also allow people with accepted answers to make proposals, even if they don't clear the score hurdle?
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An answer is accepted from a user because it helped him more than the other answers. Between an answer with a score of 5, and another answer with the same score that has been accepted, there isn't much difference in term of quality; it just means who asked the question preferred the other question for any reason: Maybe one question contained example code, while the other didn't use any example snippets; maybe the accepted question was given from a user the OP trusts better; maybe the accepted answer was more understandable from the OP because it used words that were more comprensible for the OP.
So far, I have seen accepted answers with a score of -2 or lower. In this case, the OP (a single user) accepted the answer, but 2 or more users down-voted it. I think the two down-votes count more than the answer being accepted.