Overlapping pixiv artists

Anyone care to determine if these overlapping artists are the same/different and separate/merge them or explain in their wiki pages?

• https://www.pixiv.net/users/252552: shiraishi_yuuya / baddest_bock
• https://www.pixiv.net/users/494732: misoshiru_(meridianchild312) / yosu_(surume-ika)
• https://www.pixiv.net/users/6493563: syu_kamiya / sasaki_ryou
• https://www.pixiv.net/users/3407288: sou_kana / mozukuzu_(manukedori)
• https://www.pixiv.net/users/225834: jomo_(haccapan) / ediblepanda
• https://www.pixiv.net/users/634659: mocha_(monocromer) / shishio_(artist)
• https://www.pixiv.net/users/3624365: revo_(artist) / kayama_kouji
• https://www.pixiv.net/users/9146390: unicsourse / pozesuke
• https://www.pixiv.net/users/647094: darjeeling-tea / earl_grey
• https://www.pixiv.net/users/156380: ichika_(ichi_ka0) / kusano_houki
• https://www.pixiv.net/users/15247777: megapai / kaitsu_tokiyas
• https://www.pixiv.net/users/1878752: nishikiori / ni_(pixiv154638)
• https://www.pixiv.net/users/20735: kosame_sarasa / clses

https://www.pixiv.net/users/252552
https://www.pixiv.net/users/3352237

In the first one Yuuya addresses that it's an account he registered for sketches, but hasn't sketched much ever since. He links his other user in his profile. The only confirmation from Bock I could find so far is his twitter username.

I got the same question regarding Ocha and Chashiba Katase

That said, all the social media under Ocha got nuked