Well IIRC username: banker was used by an Indonesian scammer account farmer earlier. I don't find any related gambling accounts with that name now. Somehow I felt that this had some connection with that since both are Indonesian.
There is a user at crypto-games with nick https://www.crypto-games.net/player/banker
CG owners or mods might able to help out with the UID's connected to the "banker" username if they can check the UID's who used "banker" at the time of post they made. But I hardly think they will do so. Anyway there are other ways as well so won't push it up.
But I think they probably just posted a name they saw earlier in the thread to build post count and activity as marlboroza suggested.
Yeah could be possible.
Will check for some other proofs.
Other connections(your last one, joniboini's and cheaterdetector's) are solid, I am not sure about CG connection.
