Hey there mom of two crazies,
For starters, I am not sure we can reliably say the door was shot in. It may have been... and that would suggest an aggressive offender, willing to be heard to get to his target.
If one was tied up, it means the offender had time.
For the type of car, that could be a suggestion of the personality type, but we can’t be sure the cars were involved at all. There is some suspicion they could lead to a witness or directly to the offender, but we will have to wait and see.