We were told by Shimbori without a translator that the reason for the X05 > Final build change of the game was, "Itagaki likes fast paced games."
Not really an answer, but I think it's basically telling that the rumor was true: Someone showed him how to properly play DOA3 and he was like "WTF!?". In addition, the VF beta testers didn't probably do much to help the situation but I don't think blame can be left all on them. After all, any of their suggestions would have had to be approved by Itagaki.
The rumor is that someone was talking to Itagaki and asked him Why he was making Bass so much better than his already top tier self in DOA3. Confused, Itagaki asked, "What do you mean top tier? In DOA3, he was bottom. He's so slow.". This can be seen in the DOA4 E3 Trailer where he made his
perform a Guard Crush, and the follow-up (guaranteed)
caused a hit throw to occur which would leave Bass at disadvantage if the opponent teched the throw once hitting the ground.
Additionally, Itagaki delayed the game by a full month, missing the Xbox 360 Launch for 'last minute changes'. X05 was around 2 or 3 months prior to the delayed announcement.
Lastly, due to the delay from Itagaki, Dr Dogg had to start working on the DOA4 strategy guide with the X05 build. Things I remember him saying in the build were so positive. Like Hayate's
was +1 on guard. Kokoro had solid two hit natural combos and had frame advantage on her attacks. You couldn't hold while in guard break or guard crush. If Jann Lee did
then charged up the final
, you could step during his charge and the release of the charge would not track. Side stepping looked improved from 3.1, had the things many of us were looking for as an expansion from DOA3, and the game looked amazing.
Then he pulled the switch-a-roo.