I don't see any concrete evidence of linked accounts here, P2P transactions between multiple accounts are more likely to occur outside of the forum if the accounts in question are from the same region or share the same local board. Nigerians' only way of converting BTC to Naira is through P2P, and it's possible that 2-3 people are using the same Merchants on P2p exchange to deposit their weekly earnings and receive Naira in return; your findings fit perfectly into my explanation; the accounts could be using the same Marchant, but I personally don't see any connection here.
Like I said they are free to explain here. What you said is also possible. I admit I have to change neutral a bit and will edit some part but it will stay as a warning to anyone dealing with them until they come and explain this with proofs.
This appears to be an attack on a specific region, which is not acceptable.
If you think that I took users from Nigerians local board and connected them then you are wrong. I started with simple wallet digging is that's all. I have connected 3 accounts with martyns out of which 2 users haven't posted in Nigerian board ever. So its a humble request to not make such remarks which are not true.