Not a schizo but

She had less then 10 active users on her site and probably knew most of them.
Offered to email it to people
Kosaki was interested in the code according to kay (might be a lie)
Kosaki was active from the start, he claimed he was the first post on the site before deleting that post.
He also claimed he was there 24/7
The messages posted by admin there matched his typing style and vocab
If Kosaki is somehow not involved he is allowed free reign there
Presumably Sico is a mod as mod applications went fast and were appointed with no delay (previously known to admin?)

If anyone emailed sico asking for the code or applied for mod on easychan and actually got a response it would help disprove its just run by Sico.

The domain registration thing is sus too