Trust me a good forensics team knows the diference between a legitimate PC failure and an attempt to manually destroy data. And no you will not typically get a blue screen following an improper shut down. There is an extremely rare situation where it might occur, providing there was already some underlying hardware issue. This would be real obvious to the techs.
They know exactly when that drive was trashed. They know it occured while KC was accounted for. They know it occured while LA was "retrieving" the Laptop. He deliberately went to a place KC had known to be staying and altered or tampered with evidence before LE could retrieve it.
They have the absolute strongest obstruction case against him. Yes CA probably destroyed evidence when she washed the pants, and GA when he cleaned the trunk. But there are multiple ways of interpreting those. GA certainly knows how close to the line he can skirt before he is in obstruction teritory. This is clearly apparent from his LE interviews. LA has a big problem with that laptop.