Hey everyone, I'm new to the forum but I've been a very long-time constant lurker, reading all these discussions which I found very intriguing. Anyway, this particular 'debate' fused me to actually create an account, and came out to the surface because of one thing: Sstimson's persistence in this had totally reached my nerves. Well, I would've pouted out many harsh words if my account was approved yesterday. Thankfully it didn't happen anyway, because I'm much more calmer now to NOT post a painful sarcastic reply.
Well, this might be a late reply with the subject already proceeding to another discussion but I'm doing it anyway.
A friendly advice to Sstimson. Seriously, STOP being so persistent with your absurd (? not sure if that's the right word. Sorry english is my 2nd language) reasoning based on your FEELINGS and not the real facts. You reminded me of my cousin, who basically
knew/realized he was wrong on certain issue but kept on insisting on matters that came from his mouth as if that was the truth. He then started to bash other people who were trying to tell him that what he was thinking/saying was WRONG. He kept on insisting, raising tempers to everyone, replying friendly suggestions and corrections in angry manner. It got me furious enough one time that I eventually pushed him through the stairs to stop his constant false-deduction (
WARNING! don't ever attemp to do the same! I admit I was a very vicious and brutal men in my younger days... hence the reason why I'm a BO member 
).
Just give up already... many people gave you logical possibilites which are based by fact, but you always shoved them back with irrelevant questions. Fingerprints, Smoke Bombs, ET right...? Do they really need to be brought to the discussion? O_O You're making simple things sounded ridiculously NOT simple *sigh*, redirecting facts with out-of-place facts.
Here's food for thought for everyone (which I'm sure you will eventually argue). A bit late to the party though haha:
1. In File823 when Okiya carried Sera to her room, notice that Sera's hat (later worn by Akai) is there. You would remember that the hat was later found on the train's corridor by Ran. Okiya - Sera's hat - Akai. See the relations there?
2. In File824, notice that Conan was not in Ran's group, and when he made the call to Yukiko, he's still standing in the smoke. Now, WHERE did he go after that? He was NOWHERE to be seen after that. If you said that Okiya is busy guarding Haibara, have your realized the possibility that Conan could've take over his place while Okiya, somehow, returned as Akai approached Bourbon. In the end of the file, Conan said that 'Haibara' will be waiting in other room, it was never stated that it was REALLY her. It could've been Conan all along, who was guarding Haibara in her room. Could anyone even tell where he had gone after that?
3. Geez, KID doesn't KNOW Akai... if he actually had MORE THAN A DOZEN accomplishes in that train, he still wouldn't be able to disguise them as Akai, because he NEVER met him. Yeah, Kid's father was in US... did he ever meet Akai? Don't know, who cares... but Kid, THIS Kid who are involved in the train, as far as I know, NEVER operates outside of Japan (I don't know details about this though, so feel free to correct it). More than that... Akai has been 'DEAD' for quite some time.... O_O
Dear Mr/Mrs Sstimson, I think you should just rest the case, cut the chase. Stop trying to counter everyone whose opinion are based on simple facts by bashing with your own, and twisting it with additional details that sounded more ir-relevant to the initial discussion. Thanks for providing your theory to us, but IMHO it has gone overboard now. Please, please... just stop and discuss about other stuff already. Be a good boy/girl and accept the fact that you might be wrong in one or two opinions. It's okay, nobody's perfect... we will accept your regret with open hand
...
On to the next topic! Here's my quick thought (quick as in what simply occured on my head by the time I'm typing)
1. One thing for sure... Haibara already knows that Okiya is someone 'familiar' to her, so she will be confronting him (or Conan to tell him) for sure.
2. If he's actually such an awesome agent as he's supposed to be, I think Amuro might leave Kogoro's office and disappear because he knows his identity is already exposed one way or another to the agency.
3. I don't think Conan will inform the FBI, because that will mean blowing out Akai's cover and endangering Kir's.
One thing I'm eager to see is that we're going to have more explanation about many things in the next file for sure.