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What if Tsukumo Sana is actually Senzawa? I mean look at her name SANA that's kind of like the SENA in SENzawA but with an A! Senzawa has been inactive on YouTube since Jun 17, 2020. Just in time to start preparing for the upcoming auditions. There's other evidence as well, on her twitter you can see her gremlin speak come through "sena is bIG".
The most obvious hard piece of evidence comes with Sana's obsession with the colour blue which she has tweeted about a few times. In a stream now archived on BiliBili, at 10:13 Senzawa mentions that her favourite colour is blue. The kumo in Tsukumo obviously stands for coomer, which is at least half of Senzawa's audience. I would like to add that Senzawa Twitter account USED to follow some hololive members. But ever since Sana appeared, Senzawa account stopped following Hololive members, but it's possible she forgot about unfollowing some of them.
So long as the connection between Sana and Sen doesn't compromise her real life identity, discussing this stuff is fine in my eyes. Still, if either account starts getting harassed with this I won't hesitate to take the post down myself. I'm making this because I enjoy playing detective, not because I have malicious intent.