I don't agree for Toll posting and Pointless discussion he should be banned. Many users trolled in the past. CH was the last troll who is in my memory but before him we had many. None of them were banned for trolling. Pointless discussion is subjective. So it's hard to make a gesture from it.

If the user is really can be banned again then it's the ban evading. But whats the point? He will come back with another account and will keep doing the same until you or someone else find the connection again.