I was quite reluctant to write the response which is why it took me so long to do it. Riley will feel compelled to reply, he has to set the record straight (in the cosmic history book). I'll give it a miss next time unless Riley says something interesting (not likely - it'll probably get quite toxic).
I'm sorry this thought didn't make it in (only occurred to me this morning), but Joseph Hansen who was Trotsky's secretary in Mexico and later a leader of the SWP(US) dismissed Robertson as "a talented archivist." Apparently Robertson's apartment was full of boxes of dog-eared documents, minutes, letters etc. from various Trotskyist groups. And I wonder if he got lost in his reading, maybe he became a character in the docudrama, and built the Spartacist League as a place where he could act out his revolutionary fantasy life (a bit like wacky King Ludwig II and the construction of Neuschwanstein).