I think there's a few elements here
- Who posted first, and whether your answer was based off that
I mean, if I answered first, and there's a similar answer, I will prefer mine. Likewise, if someone else answered first, I'd rather comment to build on it than self answer
- What's the most useful.
On occasion my answer included and built on multiple answers and other sources, significantly. Its not cool to just say the same thing and self select.
In this case while your source is the same, the interpretation is different so they're different answer. At the end of the day, its a judgement call
That said, I like markovchain's answer the best (which might solve the whole problem). It feels like AngryCarrotTop's answer is more based on 'mechanics' and in this case may work better than yours when discussing with a GM OOC.
Alternately sometimes its probably ok to leave a question without a selected answer - though in moderation. If you do it a lot, people get annoyed.