He will be in trouble if all of this is true. But as an eyewitness to the crimes, he's useless.
His testimony can be very damaging. His statement says they conspired, he stayed to monitor the radio, he saw them leave for the house and he saw them come back bloodied. And he had converstions afterwards with them and also with another, SOI4. I would say he has some very damanging eyewittess accounts.