To clarify a few points:
- Your question has not been marked as a duplicate. Some users have merely suggested it to be one.
- The other question was not "downvoted into closing" - downvotes cannot do this. It was closed because the claim that Hungarians were Turks seems disproven by basic research.
In my opinion, these two questions are not actually duplicates. The other question is focused on the veracity of claims for a Turkish origin for Hungarians and Bulgarians, while yours is a more open question asking about Bulgarian ethnogenesis.
However, there's a good answer on the other question, that also answers your question. It is, I think, a bit of a shame to let it languish on a closed question. Likewise, your question has received a good answer as well, that we wouldn't want to go to waste.
This makes marking these two questions as duplicates an unattracting option, in my view.
I therefore agree that a merge may be the best option. Since the other question has been closed and by all appearances abandoned, while yours demonstrate much greater effort as befitting of History.SE's current standards, I have merged the old question into yours.
My apoplogies for rendering the Hungarian portions of the old answer seemingly off-topic. Nonetheless, I think overall the benefits here outweight the harms.