Reason for Ayu's lackluster title tracks?

[truehappiness]

So.

I've been wondering why the album tracks have been so lackluster lately... and I think I've found out why. The compositions were all pretty good up until she didn't do one for MY STORY and used the same person three times in a row afterwards who worked on Memorial address.

Let's recap who composed what:
A Song for XX : Yasuhiko Hoshino
LOVE~destiny~: TSUNKU
appears: Kazuhito Kikuchi
Duty: Ken Harada
I am...: CREA
RAINBOW: CREA+DAI
Memorial address: Tetsuya Yukumi
(miss)understood: Tetsuya Yukumi
Secret: Tetsuya Yukumi
GUILTY: Tetsuya Yukumi


I think she should really give someone else the reins for the album track... maybe tasuku or something, because Tetsuya seriously went down in quality like WOAH after Memorial address. Anyone else think so?