I’m going to try a theory that could work for defense. See how many holes can be punched in it.
For this theory, I am assuming there was an intruder that no one else saw. I don’t have all the facts, so I may state something which is not true. This is just a theory.
IF and Leila are left home while everyone else goes to game. (or are gone somewhere else). IF goes to take a shower. Hears Leila screaming, throws on clothes and runs out of shower, slips and cuts himself on something, yelling, what’s wrong? Sees man running outside of house. (What if it was the guy watering the lawn?-just speculation…
Leila is now quiet (maybe already dead). Being 12, his immediate reaction is to call parents and get them home. Maybe calls parents but they don’t answer phone (we don’t know if this is the case or not). Gets older sister on phone, who relays info to CW who calls 911.
Assuming IF hangs up with older sister and 911 calls him back straight away, he may not have even seen Leila yet. 911 asks him how his sister is, and he says he doesn’t know. Walks into her room and finds her a bloody mess, tells 911 she is hurt, leaves his own bloody fingerprints around, trying to see if she is OK.
A second theory has IF cutting himself on something or getting bopped in the nose in his sister’s room while they were horsing around, prompting him to go take a shower and clean up, then everything happens as above.
Why would this not be possible? And I am not talking about watering man not seeing someone running away. He could have been off on the time. I am talking logistically speaking, why would this not be possible?
Just seeing if there is a logical way this could have happened and it was not IF.