In a way, yes. But Ayu was never that musically experienced to begin with. She used to compose her songs and every once in a while arrange them. Composing is just when you come up with the melody you sing to. Arranging is when you decide what instruments to use, and where they go in the song. Didn't she say a long time ago that when she composes her songs she actually just hums the melody? Besides, the last Crea thing she did was Will back in 2005. It's been 9 years, whatever experience she had I'm sure is pretty rusty.
I'm not sure if she plays any instruments, or can read sheet music, but I have a feeling that if you gave her a vocal track and sat her in front of a
sound mixing board and told her to make a remix, she really wouldn't know what she was doing.
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Actually going back and looking through her stuff on eneabba, I realized that her "Crea" career was pretty short lived. The first thing she did was M which was released December of 2000, and the last thing she did was Will which was released September of 2005. That's less than 5 years. Actually 99% of everything "Crea" did was from 2001-2004. M was the only song she did in 2000, and Will was the last and only song she did in 2005. So if we really wanted to cut it down, we can say her Crea stuff was only really 3 years long.
I have a feeling it was just a "Drizzly" type of one time thing that she's not going to attempt again. The bulk of her self composed/arranged songs were around the I am.../RAINBOW era which is around the time A Best was released. It was the highest point in her career. She was most hands on at that point. It only made sense for her to have a crucial part in music releases around that time.