The only reason I could see the mods blocking Zumzeros IP and NOT VE OR CRUMBS would be that they could clearly see that zumzero was obviously part of the scam which could have been given away by his IP address..
Yeah because we all know that Theymos takes a hard stance against scammers on bitcointalk. (Bitcoin Savings and Trust, Labcoin, etc...)
I am guessing Crumbs got a perma-ban but he uses proxies to get past it whereas other people don't care that much.
He has stated before that he will not release any information about scammers "unless there is a warrant". That doesn't mean that he won't take small actions in other forms, such as banning a scammer who is posing as a shareholder. Maybe its his way of cleaning up some of this BS after labcoin robbed everyone blind.