Thank you.
Your comment that SC could not do it is opinion only - there was evidence that she had handled guns before from a witness - and if you took the time to read the facts about "residue" on the interesting new thread on here then that will have educated you. One of the reports about blood on her hands etc is ambiguous to say the least.
So in fact the forensics that you say are discussed are nothing to do with JB having committing the crime. End of.