Didn't like this one bit - seemed far too artificial and staged. I can think of two primary reasons why this seemed illogical, and I'm sure there are more:
Why did the wheely-bin with tape suddenly appear outside the house later?
In real life the left-handed/right-handed assailant evidence would have been decided straight after processing the crime scene - it was horribly manufactured to leave the reveal right until the end.
Hoping that Case 5 is more realistic.