What is the maximum controller could be use in nba 2k10?

I tried using 2 logitech controller (2 person using), 1 twin joystick (2 person using), 1 twin joystick (only 1 person is using because the other controller is broken), 1 keyboard (1 person using). A total of 6 players playing, the problem is only 5 profiles are shown.

then it is probably 5