It's quite simple; learn your facts before spreading misleading information to a community in hopes of getting what you want. Because Itagaki actually had a vision for Lisa, and she had a story on the side that also released the theme of the character right away: someone you want to like, but can't trust.
If they put Misaki, Luna or Tamaki in -- they would be complete throwaway characters to anyone expecting something cool and refreshing to the series... and once again Team NINJA didn't make these girls and we have Honoka.
To answer
@NewWestFan yes; they are painfully generic in most cases, but if people like them in their volleyball game sure. I think the most unique thing about the three is Luna. She is super freaking short. It would be like fighting Yoda in SCIV for one of the guys.
Honoka's generic as well (no offense to her, but she really is to a certain extent. She's pretty much the Kirby of Dead or Alive), even with her being implied to be related to Raidou. As a matter of fact, Marie Rose ALSO is even MORE generic than Honoka since, unlike the other newcomers, she literally has no connection to the plot in any way (Phase 4 is the latest line of Kasumi Clones, and besides which actually FOUGHT Bayman in the game at one point; Honoka at least has her being implied to be related to Raidou and Ayane in some manner, and even Nyotengu has her pursuing Ryu Hayabusa for reasons that are tied somehow to that Tengu from DOA2). Last I checked, that didn't stop them from creating them for DOA5U or DOA5LR. And besides, Luna's introduction episode literally hinted at her knowing Karate and/or Bushido, and the latter's a fighting technique they HAVEN'T used in the series yet (I'd know because I'm the one who translated/transcribed that episode via Google Translate). Heck, on that note, Marie Rose and Honoka are roughly Luna's height. If they can get into the mainline fighting games, so can Luna. And I'm not spreading any misinformation at all, let alone doing so in the hopes of getting what I want (for the record, even if I WERE to consider spreading misinformation, which I wouldn't because it's dishonest and dirty, I know the Japanese developers will ignore me and others anyway).
What would they offer DOA from a fighting perspective that's new and original? Not sarcasm I have no desire to ever purchase or even watch VV or most of the extreme games so I'm ignorant here. Are they super original and creatively designed? Because from the pics I've seen they look pretty generic ecchi.
Being generic ecchi didn't really stop Honoka and Marie Rose's creation and inclusion into the franchise, so I'm doubtful Luna being that would be a reason to leave her out. Besides, considering her Event Episode debut actually had her using the Karate greeting, and also mentioning Bushido, I'm pretty sure that Luna at least knows those fighting techniques. And while Karate is already used by Hitomi, Bushido is a fighting technique that ISN'T used in the Dead or Alive series yet, so having Luna in DOA6 would actually bring a new fighting style to the mix. In a way, bringing her in would actually HELP the fighting element of the franchise by introducing a new fighting style. I know that would have been MY rationale for adding her in if I were Shimbori. Regarding Misaki and Tamaki, well, Tamaki could use a fighting style that mimicks bouldering, even have her be self-taught, and Misaki could get some other fighting style that suits her. Hey, if they can give Lisa a Mucha Libre fighting style when she got her formal debut in DOA4, I'm pretty sure they can think of something for Misaki and Tamaki.
Yeah, and if Marie Rose can get in despite being a dwarf and the smallest of the cast in more ways than one, I'm pretty sure Luna has the same chances, since like Honoka, she's only an inch taller than Marie Rose.
I wonder if the Japanese fanbase is clinging to this same line like the obnoxious NA fans are. You know. The ones who can understand what he said without running through translators.
Unfortunately, as
@just_me pointed out, there's no way we CAN know what the Japanese fanbase thinks of that line or cling to it, because unlike, say, the American Comic and Films statement which at least actually WAS transcribed in Japanese via Famitsu, he told this to GameSpot directly, presumably in English, without even leaving a transcript of the interview written in Japanese, so as far as they can tell, what he said in English IS what he said in Japanese.
There is no Japanese version of the article, nor a full version of the interview, so they wouldn't know any better. It most probably wasn't a direct translation either, since I really doubt that Simbori said boobs/oppai/おっぱい …
Considering they also talked about how they reduced the jiggle physics to such an extent that they are literally not noticeable, I wouldn't rule out Shimbori actually saying that and that was a direct translation. Besides, SJW or not, why on earth would GameSpot just falsify a translation like that? I'm pretty sure if they did that, Shimbori would have sued them for defamation, meaning they wouldn't dare screw up something like that if their lives depended on it.
Anyways, we really should stop talking about this.