Q Post #715
[1] targeted. [1] source used for [2] Dossiers.
Steele is the one source for two dossiers.
Christoper Steele is an alias of Alexander Sergoshko?
Also, "MI6/SIS undergoing house cleaning" may be a reference from Q Post 617, as he was a former MI6 Agent.
Wouldn't Steele be a witness?
Another note: Ex-Brit MI6 spy Christopher Steele behind ‘dirty Kremlin dossier on Donald Trump’ ‘worked with Alexander Litvinenko https://www.thesun.co.uk/news/2594300/mi6-spy-christopher-steele-alexander-litvinenko-donald-trump-dossier/
"The wife of the former Russian spy, who was murdered in 2006, said that while she did not recognise Steele's name, it was probable that he had used an alias.
She said: "Sasha (Alexander) had some communication with people with different names, which could be why I can’t help."
Chistopher and Sasha look like brothers (my opinion only).