Where is the evidence? And base on your title it is not as strong too.
If it will be based on activity, it is not just 4 of them to be linked but 6 of them including Hotpov22 and Larr23. As I said the evidence is still not in a good foundation.
The claim submitted by him contains credibility because the accounts have the same Local Time "November 29, 2018, 08:40:43 AM", Last Active, and posting style "Same bounties campaign".
+ I think S/he is using a bot for posting because his Twitter accounts have been suspended.
+ This is a forum for discussion about Bitcoin so it is unacceptable to have all your posts in campaigns/ bounty tasks.