"For Krystal, we didn’t have any of the technical modeling knowledge that we had cultivated with Fox and Falco, so it was like making a brand-new character from scratch. And because of the limited amount of time we had, creating Krystal wasn’t realistically possible. On that point, with Wolf we already have some knowledge of how to model his character, and would require about 70% of the effort required to create a whole new character."
In other words, and this applies to many others not just her, she would've taken more effort to model and create compared to Wolf where they already had an idea, even if he ended up being very close to a clone. The questions and answers is old as the headline states, but it may be different now that they have Namco Bandai helping him out. Remember, it was they who made Assault and they did design and model her in there, they also did get Ryu in there who was an entirely new character.