I've almost always housed my buttons in a group. I had one pair that was the exception. My current group/setup is actually the best that I've ever had, including better than the pairing. I have five hens and three roos in the group. They're in a playpen converted into a cage. I have no feather plucking, no fighting (some dominance between one of my higher roos and the bottom roo, but no actual fighting), and all around, basically no issues. They huddle together and sleep in a clump of bodies at night. When I had groups before, my main issues were feather plucking. I think that was mostly because of spacing issues though.