But we know that now. Do you mean Naofumi didn't know about it during the beginning of the assassination scheme? Sure. But it was easy to guess, and yes, I totally did guess it the moment I saw it, which is why I thought Naofumi would too.
The point I was trying to make in those statements is that the crystal is in fact a recorder and a playback tool, NOT that Naofumi knew that. Stop mixing up my arguments with each other.
I did mention some other magical means of communication, but that's irrelevant. I was just using that as an example that conjecture is meaningless in the face of direct evidence.
I already said I didn't predict they would photoshop it, but I thought they could edit the video to make it seem like a fake kidnapping or assassination. I didn't think they'd spread it in towns. I just figured they'd try to accuse him in a trial again. I can't do anything if you don't believe me. Just know it's ridiculous to lie to someone on the internet who has no bearing on my real life.
Let me put my argument in a simpler way:
Naofumi saw a crystal that clued him in on a scheme because he saw it before in the King's throne room. Said crystal was still with the retreating soldiers. He should've tried to retrieve it even if he didn't know what exactly it did, even if it wouldn't actually help him in the future. Why? Risk mitigation. It may or may not yield results, but the cost of him retrieving the thing (a yes to Filo's offer) and also possibly preventing the soldiers from reporting the results of the scheme was so low that not doing so is just stupid. Whether it would actually help him or not in retrospect is conjecture due to lack of information and is irrelevant.
The funny thing is, one line after he said "No." to Filo could've fix this:
"Something is fishy, so this could be bait for us to chase them into a trap."
I can't put it any simpler, so if it doesn't get across with this, I'll stop here.