I haven't listened to the album yet, but am excited to do so based of what people seem to be saying.
Re Timmy - I've got a kinda-sorta theory about him.
Ayu started working with him likely 2010 onwards. I think that's him near the start of the Microphone PV, and he obvs worked with her from 2011 onwards with BRILLIANTE and then being a full fledged back up singer. If you consider what Ayu was doing here, she was embracing a more fun-loving and eccentric side to herself.
Just look at Lady Dynamite PV - likely her biggest gay anthem and probably one of her most fun PVs. If you consider the tone of a lot of songs of Rock n Roll Circus too - Sexy Little Things, Lady Dynamite, Microphone jump out especially - they are becoming either more quirky and more bold. Her image itself changed - especially in the persona she had publically. Whereas previously she'd just been 'Ayu' who, yes, did put on grand shows and stuff, she was now tryna really become some sort of Diva. Her style around this time and even beyond is super reminiscent of Western artists ala Madonna and Lady Gaga, I could sooo see Madonna releasing Party Queen (the song) at some point to resurrect her career in the early part of this decade. To me atleast, she now tried to cement her image (afterall bitch had now hit 30 - she can't keep relying on her old style) on these big western Divas and I think Timmy (being a lot more bold and brash than any nihinjin person) was a way to do this.
If you hang around with loud extravagant queens, even the shiest introvert will open up. Her thinking of herself as a Goddess in BRILLIANTE's PV to her being a trashy Party Queen in NaNaNa and Shake It, using more flamboyant, wild and extravagent styling when live (i mean look at Timmy live. Actually... maybe don't.... for the sake of your vision) and even performing differently (idk but before I used to think that you were actually participating in Ayu's concert as she is constantly beaming and inviting you to dance along.... now for the most part you just feel like a spectator watching her perform (aside from ofcourse the customary MY ALLs and SURREAL/evolution/Boys and Girls)) kinda seems to me like she's trying to become a bigger personality and become an everlasting Diva (given that I think she herself could see after Secret that her popularity was declining).
Or.... maybe I'm just crazy and this is utter tripe. Highly likely given that is 4AM here. Equally, Timmy might just be hiding the more undesirable parts of his personality from Ayu. Even if she read a tweet about Grindr, does bitch even know what it is?
As to why Timmy's never composed past Party Queen, it's obvs. Ayu is just over cautious. One thing doesn't go her way, she instantly reverts back to before. GUILTY came in at #2.... bitch ran 100 country miles away from rock to tender arms of Electro Dance in NEXT LEVEL. Even when she called her album 'Rock n Roll Circus', she only put one actual "rock" song in (Microphone... though perhaps countdown sorta counts (see what I did!)). Party Queen's #2 ranking means Timmy was of the composing rooster as clearly Japan wasn't here for him (which tbh is a shame coz aside from Eyes, Smoke, Magic he's actually a damn good composer).
Colours flopped epicly, so Ayu rehashed the popular bits of her discography with A ONE and left her experimental side at an orphanage without looking back once. In Last Minute, the black bit being expelled out of Ayu is her experimental side, which has had its 'Last Minute' and is now history.
Well....maybe I should actually listen to the album before critiquing it further.