I was playing a game with these three and reached a point of total dominance, where everyone would normally start flagging. Instead the remaining "three" players above went at me hammer and tongs, ignoring opportunities to get easy kills off each other. Nothing was said. Nothing I typed was responded to.

Eventually I said I'm off to write some reviews and sat out. After my dice went out of the game I watched. The largest of the "three" players immediately abandoned the game, followed by the second largest, leaving the smallest (2 stacks) to win.

I can think of no other explanation except that the above three players are in fact a single person