Where's the passenger list that includes b-days? That'll help narrow the field. Likely that anyone of sig re: DS is not going to be a youngster.
Has there been any sauce on his supposed alias? Saw that puppetstrings site earlier too; sounds like a reasonable theory but to just say 'he goes by another name..' POOF-deus ex machina proof.
The name Sergei there is like John here, millions of them. Not saying it's untrue, but if trying to redpill helps to have stronger ammo.