I explicitly qualified "have been there all along" by pointing out that the teams I was talking about were there by the beginning of season 3. What happened before season 3 I don't care to know, but I think it's fair to say that earning your NBA spot in season 2 was hardly an achievement.
So you're talking about two promotion periods, before seasons 4 and 5? A grand total of 8 new teams in the league. I fail to see your point.