It wasn't until Penny and Greg were shown the medical files of FS found by a detective/researcher that they discovered  FS had no physical damage from the grenade.  Penny was generous with her information and, now,  we need to rewrite that part of AA's history.  The actual source will probably be mentioned in a book and you'll get to see a copy of the document I'm sure.
She may have been 'shown' it but I don't see it, don't believe it unconditionally, and would have to have it backed up by a more credible source before I believe it. Certainly is strange this shows up now, after it never did in the trial, now after all these years when something so old would have been lost, or destroyed in the bombings of WWII, it suddenly magically appears just when someone is trying to find a way to conveniently dispose of FS (probably so AA can still be AN)
bear, you do amaze me that you blindly accept anything you want to believe, no matter how vague, yet completely shut the door on other things you would rather disregard (like the DNA)
History is often in need of being rewritten when new and sound evidence is found.
You can rewrite it all you want, but if it's only fancy and fiction, it means nothing.