the last time he was banned he wasn't told to come back in the message?
The ban message seems to imply that he was told not to come back.
Then why wasn't he banned when the account was made?
Because he's literally been here for two weeks and there's no way badspot didn't notice.
Badspot doesn't browse the forums hunting for users to ban. If nobody reported him and he didn't notice the name then khanu very easily could have just gone unnoticed. Remember that thread the other day when the guy wanted Badspot to personally approve every new account? Badspot explained on there that it was too much work for too little reward, and that many returning not-as-malicious users wouldn't be here then.