Maria's personality is very child-like and innocent, and ever since her intro in File 548, she never showed any signs of having an adult mind (more than likely because even if she happens to be Asaka, she was probably not initially conceived as another APTX victim). How Gosho could handle such a plot move, where a seemingly normal older character enters the plot, is maybe by playing the amnesia card, meaning that Maria suffered memory loss as a result of a post-traumatic stress from the Kohji case. In which case, Maria-chan may have lived those 17 years with her "grandparents" in the Kansai area as if she was a normal child.
How do you live for 17 years as a normal child who's stuck as a 7 years old? That's the opposite of normal. Amnesia or not, shouldn't she have grown mentally by now?
Iori Muga, who I deduced could be Rum,
And no conclusions were drawn?
hey, you're the one who brought it up.
Asaka was also compared to Ran (File 954),
And yet you ignore what was said just a panel earlier by Okiya.
How do you connect this notion to Maria?
In other words, 17-year-old Maria came along with Haneda Kohji to the US in order to watch him play in the chess tournament. Her black hair colour in the Asaka photo would be as a result of her dying her hair black, like how Gosho seeded that concept in with Takashi during department store case (File 941).
Aren't you just recycling and repurposing old ideas you claimed to be hints from your butler theory?
If Maria shrank as Asaka 17 years again, then the true purpose it would have would mainly be to answer the question regarding Conan's and Haibara's aging state, and that answer would be that they can't age like Vermouth, since Maria is still a 7-year-old, because, as mentioned above, the drug they were affected by is a recreated version of the one Asaka would have been drugged by (and is very likely to have the same effect). If Maria has been a child for 17 years then her parents would be much older and the parents that she is currently said to have (File 1006) would have to be fake/stand-in parents.
Going back to the idea that Asaka was Kohji's sister who inherited the hand-mirror from her mother Haneda Ichiyo, there's another detail about Maria that fits with this interpretation. In File 1006, Maria's grandma gave her the advice "it's important for a girl to watch over her appearance", which is very consistent with someone who would pass down a hand-mirror. This could be a small clue to that Maria's grandma is actually her mother, and by extension, Haneda Ichiyo (which in turn would make her grandpa Haneda Yasuharu). In other words, those cherished memories in her reintro case was actually her with her real parents (Kohji's parents-in-paper). Considering that Gosho hid Maria's grandparents' family name outside their house, that leaves such a possibility open.
Don't you see that every step of the way in this theory is actually actually a major leap you don't have anything to base it on other than "ifs"? You don't really have any evidence for any of it, just the notion that various stuff counts as foreshadowing, yet you still build this weirdly convoluted theory based on all these building blocks.
"Asaka got the mirror from her mother", leading to "Asaka and Kouji are siblings". But hey, so far it's not such outrageous ideas. There's no real evidence for it, but it's still within the realm of plausibility I guess...?
It's where you're going next that's becoming bizarre. Somehow from the familial relations between Asaka and Kouji you're jumping to the idea that Asaka wasn't a bodyguard at all, but actually a teenager who came to cheer for her brother and then was drugged and then deaged and then remained at the same age for 17 years and what is any of this even based on?You're actively refusing to acknowledge what's stated in the text and throwing it away in favor of your theory. Why's Asaka suddenly no longer a bodyguard? Why's Asaka suddenly 17? Why ignore the text? Is this all just in favor of wishfully hoping for a more... unique outcome than the simple ones that are known to be expected from Gosho?
Gosho has a tendency to foreshadow the introduction of new plot elements by hinting at it just before it happens.
Gosho also has a tendency to lean towards simple solutions, which this one isn't.
Following my deduction regarding Rumi's identity being Vermouth, this would automatically fill in the holes regarding Rumi's APTX victim interest, since Vermouth has personal motivations for keeping the shrinking effect hidden. If the BO dismissed Asaka as dead, despite her missing corpse, someone like Vermouth, who knows about the shrinking effect's existence would suspect that Asaka is alive.
Why does Gosho need to introduce YET ANOTHER shrunken subject when we're not even done yet dealing with the third one? Why doesn't Vermouth investigate Mary if it means that much to her?
In fact, both of Maria's reappearances in Rum arc consistently followed Rumi's appearance, as if she could be tied with her in the ongoing plot (File 966 & 1006).
How is it consistent if it's just in half the cases? Besides, a super minor character who is an elementary school student appears in a classroom which is the setting the new suspicious teacher character belongs to, that's not so out of the ordinary.
- Asaka was drugged by Rum along with Amanda 17 years ago, but shrank and fled.
And she got the amnesia after she fled, before she fled, while she fled?
Rumi's goal in Teitan Elementary could therefore be to not only investigate Haibara's neighbor in the Kudo mansion (Subaru), but also investigate Asaka's disappearance.
Surely you have to acknowledge that so far Rumi hasn't done either of these things. She's been focused on Conan and that's about it.
And just for a minor sidetrack, while yes, Vermouth did wonder about Okiya, Rumi asked Haibara about meeting Shinichi, and why would Rumi ask her that if she's Vermouth? She already knows Haibara met Shinichi.