Twisp said to me "I'm done playing Discovery, I'm just going for a ban."
When I told him that we could do it, he just had to ask and didn't have to ruin his name in doing so, his response was something akin to "I have to earn it".
That in mind, the staff decided it was a good idea to take pre-emptive action to achieve the same result. The duration was just set for six months, no particular meaning to the length.
If he wants back, he can come back, but I was under the impression that Sir Quits wanted a little help to manage his self-control.