As far as video evidence goes, we have not seen any that actually shows KA at the house where MW was shot, but that does not mean that LE have not. I am sure they have not shown us all of the video that they have recovered, and I doubt they would show us the most incriminating.
When last her Jeep was mentioned, it had apparently not been recovered, but it may well have been recovered and forensically processed since then. I would not expect LE to issue a statement just to say that the vehicle had been recovered.
LE have stated that KA is wanted for the murder of MW, and no one else has been named a person of interest or a suspect, though I am sure that any and all who may be considered close to the situation have been interrogated to the satisfaction of LE that they had no role in it. CS has gone into hiding, which may be wise, but I would wager that he has told LE where he can be found, and they have the means to contact him. As you say, yes, there are still questions about the crime that have not been answered, but I believe no one can answer them except the suspect who fled shortly after the murder, and has not yet been found. If she had any answers that did not implicate her, she would likely be available to offer them up. JMO