User blog comment:AverageHero/The True All-Stars./@comment-1441098-20130830024416/@comment-3350823-20130830170026

To me, the reason more choices like LeShwana, Brick, Owen etc. weren't added because of the limitations they put on the show. The two big reasons being the shows short time and because they themed the season around heroes and villains, they don't have enough choices for villains, most of the characters thought as all stars would be heroes. Other characters that might be villains aren't considered all stars or maybe weren't heroic in nature but weren't outright villains (Noah actually did some good in TDWT but was maybe too snarky).

Of course some characters could be put under villains for some of their actions, particularly in later seasons. But that would mean the staff would have to acknowledge continuity and admits flaws in their creator's pets :P