It seems Felix and everyone else except the police seem to deny there were even women present that night. The other woman was named Mariana, I forget her last name, she was Dmitri's stepsister, the daughter of his father's new wife by her first husband. Anna Vyrobova mentioned her being there, she knew her personally. Both of the women were seen being put out of the house around 6am, seemingly against their will but by someone inside who thought it for their own good. As for the young brothers of Irina, there is a report of three men leaving in a car just before dawn. Felix tells in his account that he drove back to his parents-in-law's home (where he had said he'd been staying looking after the boys while the parents were out of town) where he was met as he came in the door by one of the boys begging for details of the murder. It is very possible to me that the 'three men' were Felix and these two boys, they were tall teenagers. Of course he'd want to cover for them and hide their involvement, as well as cover his own hide for exposing them to such a bad situation. Same for the women. Felix's account has left out a lot of people who were there that night though evidence supports it (don't forget Oswald Raynor, his friend from Oxford, the British agent now rumored to have fired the fatal shot on Rasputin) So in this way, even as a murderer, Felix kept his word of honor by not ratting these people out. This is one reason I have wondered if maybe this is why Dmitri was so mad at him, because he didn't cover for him?