50 merit, for what?

The 50 merit for that post is probably his way of venting frustrations after being kicked out of Stake campaign.
It is unlikely that we'll see these accounts used on the forum anymore.
Maybe JeWay dumped 50 merits on ‘Little Mouse’ post as he is the only one who hasn't left negative feedback on JeWay's account

. Anyway, he (JeWay) was aware of this thread. But he never tried to defend himself. Carrollzinha has removed him from the signature campaign, we have lost one spammer from gambling discussion board

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I'm trying to find other evidence, but nothing for now. but for the linkage, these accounts join in the same bounty campaign. I'm sure there is.
And it looks like we're going to do another big cleanup now that you've discovered this oddity. I will do a thorough check of all the addresses in the above transaction, for sure we will get more accounts connected now. Thank you for telling, Will update the list soon.
The above evidence won't be enough to connect those accounts with each other. Perhaps, the user has used ‘new address’ as a middleman so that no one can link those accounts directly. I hope guys will find some direct evidence of those accounts connection. I appreciate your efforts.