To answer your questions mate:
Sam-Sam and Yinka were put into Joe's enclosure as there was no other space to house them. When Sam-Sam and Yinka use Joe's indoor area, Joe is kept out of Sam-Sam's way in the sleeping quarters and the outside run. There are 2 doors - one for the indoor play area and the other for the sleeping quarters.
Joe was always kept in his enclosure when all this happened, just out of Sam-Sam's way as I mentioned above. Joe will remain on his own as he likes the peace.
I also feel that Sam-Sam will stay here at Twycross now. I really haven't a clue if he will move next door with the females as that group needs a breeding male after Mamfe's death.
The other group is likely to get a new breeding male soon once Matadi is older and ready to leave as he can't stay. Matadi is 4 years old now, still a way to go yet. Ndoki is our new baby female, born May this year, she is likely to stay with us.
If you want to talk more about Twycross Zoo, send me a PM. If you also want my MSN address, PM me about that too. I can tell you lots about the zoo.
James