The bulk update request #11204 is pending approval.

create alias flowsynchronomy (1) -> flowsie (32)
create alias kaddie_evo (4) -> flowsie (32)
create alias adelie_(kad) (3) -> adelie_(flowsie) (0)
create alias vera_(kaddraws) (2) -> vera_(flowsie) (0)
create alias citrea_(kaddie_evo) (1) -> citrea_(flowsie) (0)
create alias quill_(flowsynchronomy) (2) -> quill_(flowsie) (0)

Reason: Firstly, "flowsie" and "flowsynchronomy" are basically the same artist.
https://x.com/flowsynchronomy
https://bsky.app/profile/flowsie.bsky.social

Both sides have exclusive artworks, but X account is ealier.
X - 2022.2.20
BlueSky - 2024.2.9

However, if date is taken into consideration, the artist was actually doing sfw content in the past using another name: @kad_draws
They then moved to @kaddie_evo (or @kaddie on BlueSky), the old account archived in 2023.

They also has another X account @grassquirrel, just somehow deleted this account.
Proof1 Proof2

I think "kaddie_evo" has superiority because it is derived from their oldest account "kad_draws". Although "kaddie" can also be used, "kaddie_evo" was created as tag while "kaddie" was not. And a suffix is needed if "kaddie" is chosen because "kaddie" has been directed to a chatacter.

2025.6.23 update:
Though timedate is a factor, the account in which the artist is more active is more important.
Until today, @flowsynchronomy has made 10 posts in 2025, @flowsie has 42 and @kaddie has 34 (posts about Celete or else are excluded).
In this case I decide that @flowsie is chosen, and yeah it has the most posts in e621.