I think there is another account that may be linked to Sebas.tian. While browsing Sebas.tian's account history, I came across the telegram address @Oyarebu (post deleted). https://ninjastic.space/post/55389401

And I remembered that I had seen an account with that nickname before. It is noteworthy that Oyarebu and Sebas.tian exchanged merits. https://bpip.org/Profile?id=2463938

Also, if we link all the accounts presented by nutildah, Becky666's activity stopped at the same time as Oyarebu's account; the difference is in seconds.
https://bitcointalk.org/index.php?action=profile;u=2463938
https://bitcointalk.org/index.php?action=profile;u=2526732

To be honest, I don't understand why I found all this. 

As for Oshio-man's account, I noticed his activity when he was still a newbie. I personally wrote to him in a personal message and recommended that he learn to quote correctly since his quoting was incorrect. I don't know if this is a tactic to pull the wool over everyone's eyes, but I think that Oshio-man is still a different person.

Although, if we follow Sebas.tian's expression, it is quite possible that this is his attempt at diversity.