Reason for suspect :
a) Exchange of merits (though on small scale) : https://bitcointalk.org/index.php?action=merit;u=1241585
Simply sending and receiving two merits is nothing to be suspicious of.
This isn't enough in proving the link between the two accounts. Dig deeper by finding the transactions between the addresses they currently use in the campaign or in previous campaigns.
-snip-
Just a simple underscore doesn't prove anything. Their names aren't that even similar at some point.
Either lock this thread until you find a solid evidence, or simply delete it if you can't find anything.
Instead of creating a new thread for these kind of accusations, just simply report it in here Known Alts of any-one - A User Generated List Mk III (2018 Q3) if you can prove the links of their accounts through ETH/BTC addresses. If it is a merit abuse accusations, simply report it in here (List)Suspected users that are abusing merit 3.0 but judging by your accusation in their merit exchange, it is just gonna be a waste of time for you to make a report.