I don't think your proof is sufficient. Only giving merit each other can't proof merit abuse or merit trader. I think you should obtain more info if possible.
If they are alts they will be tagged for sending merits to alts. I can't prove yet, that fakegurutu is an alt, but it's very fishy.
At least hisori and sham100899 are alts because they used same BTC address.
Let's wait how DT decides if fakegurutu is another alt of hisori/sham100899.
Okay. I think below information might be helpful for you.
Both are from Pilipinas. Archive:
sham100899 and
fakegurutu Also, both person uses all small letters. Which you can see from the above archive.
Edit:
fakegurutu sent 3 merit to sham100899 at 6/6/2018 4:29:58 AM and
sham100899 sent 2 merit to fakegurutu 6/6/2018 4:36:41 AM That means merit exchanged only within 7 merits.
Both are using the same platform of bitcoin wallet.
sham100899 and
fakegurutu