Titan was reformed from a heroic team to a training team at the beginning of Legion. They earned AotC every tier for two full expansions which is an accomplishment all to its own.
Tomb, full tier video – https://www.youtube.com/watch?v=25HObM7CoWg&t=655s
Antorus, full tier video – https://www.youtube.com/watch?v=z9x6MyPeRag&t
Titan poses with Violet Spellwing mount
But their most impressive accomplishment is the number of raiders that have the knowledge and confidence to raid because of the training they received while on Titan. Many of these players came from very limited or no raiding experience at all. Some were returning players that had to relearn how to play the game after a long break. Others were players looking to learn a new class/role. In any case, if the roster wasn’t already full, no player was turned away who earnestly wanted to learn and genuinely needed the training.