That’s not how investigations go, although that seems to be the way it’s handled by the new generation.
You go where the data leads you, not injecting conspiracy when there has been no LEAD discovered in the normal course of investigation. I used to teach interrogation.
If it was a burglary, why was the intruder “after” the son, who at the time, was with his parents upstairs? No one can answer that. What is the story behind that?