I don't know if you guys remember this post
>>22097817 about Seishirou having the role of "Trainer" and Lumi having the role of "Mesugaki"
Recently, while going through some of my throwaway Twitter accounts, I found the one where I "whistleblowed" to CL about Seishirou (including his temporary name change to Sin... without altering anything else; as a side note you'll see that he has edgy tendencies), and it had this screenshot, just in case no one believed it.