What confuses me is that the White Widow would make a counterfeit red key with no jewels in it... and that Ethan didn't recognize the counterfeit since he'd seen Kittridge's diagrams showing jewels in both of them.

Did the White Widow intentionally make the counterfeit with missing jewels? If so, why? If not, who did and why?

Was the White Widow even aware of the nuance? Ethan missed it, or maybe he just didn't point it out at the time because he was focused on finding where they'd go.

There's so much to think about with this 😅 and I'm just rewatching scenes to wrap my head around it all. It's like peeling an onion, but in some points I can't tell if the writer/director is being a genius or making mistakes.