Come on guys, don't feed the troll.
I seriously hope that he's a troll. I know that it's a formal thing for an author to use their first and middle name as initials for themselves, but it's a shame that some female authors out there have resorted to using this as a way to cover up their gender (to avoid exactly this type of reaction), just because it's considered more marketable to the opposite sex.
Also, just to clear things up, Katherine wrote and created the Animorph books alongside with her husband Michael Reynolds (also known as Michael Grant now for his 'Gone' series). K.A. got the author credit, while Michael got the books dedicated to him (I guess it was an inside joke as there supposedly wasn't enough space on the spine or something), but both were very much part of the series. Also, the ghostwritten books were always looked over before being published. If K.A. felt that the characters were acting too out-of-character, or if the plot deviated too much from what she wanted to get across, then she would rewrite it (a good example of this would be #28, where she completely re-wrote the ending scene of the book.)
