You seem to think that the tiers in TTA are similar to classic arena - they're not. In TTA, only a small number of players is allowed in each tier other than bronze I, which in classic arena is only the case for platinum. Hence, the late mid-game and end-game players, who are in gold III or IV in classic arena, are spread out across the gold, silver and high bronze tiers in TTA. Personally I've been in gold IV in classic for a long time, but in TTA, I'm generally in bronze IV or silver I. For newer players, it's only when they can reach gold comfortably in classic arena that they should expect to get out of bronze I in TTA.