Hugo, this doesn't prove much.
Corbii buys alot of diamond and even gets paid in diamond for certain jobs. I personally have hired him to help out with my base and paid him a stack of diamond to do so. He also has other user accounts.
however, if a member of staff asked him to type @hi and he didn't respond then he would be subject to punishment. What I am saying is, he doesn't have to answer to you or anyone who isn't staff.