There is no tough proof that connects Rizwanindia and asiwajuadejumo with
https://www.facebook.com/serhii.docenko or
https://twitter.com/s_dotsenko as there wasn't any post/tweet made from those accounts were being posted by them. They only posted social profile links which can be known if you look into a bounty participant's post history carefully.
Due to the fact that a lot of bounty managers just simply don't check, those users most likely thought that they could leverage some other person's profiles into a reward for themselves. I believe this is probably a common occurrence.