He gave a lot of facts, provable facts not out in the public before his testimony. At 5 days, the investigation is all preliminary. Other analysis is proceeding, both by government and privately. Private investigations, are driving questions, that sooner or later will be answered. Nothing of the official (multiple) investigations is truly suspect at this time, as they are preliminary.
I would be interested to know where you got the bit about washing the roof.
More than that, know the ballistics of the bullet that penetrated the shooter's head and then either penetrated the roof or ricochet off the roof. I am not saying it came from the open window in the building immediately behind the shooter, but until seeing ballistics, I am not saying it did not. There are many questions to be answered, at this point.