1. No, you mean like his Ethereum address?
Yes, there's nothing else he can sign. He has to have staked the address here somewhere though.
2. He made it because he was part of the team at that point.
4. This is my main account that I will always use from now on. Being I am the CEO now and not the CTO, I wanted my username to reflect that. I have
built up this account with lots of activity. Now comes the merit.
Would he be willing to sell/give you his account? Or is it too valuable to him for him to do this?
In summary,
1. Get him to sign a message with an address he's posted here via his electrum wallet (see above for the tutorial).
2. See if you can buy his account off of him, you might be a bit more able to get theymos to change the thread ownership then maybe or you could just use his account.
3. Lock the old thread and make a new one that is identical and put a redirection link in the locked thread.