Even for a true high-level Grandmaster, helping a mid-level Grandmaster break through the Heavenly Barrier would require an immeasurable sacrifice, and there is even the risk of demotion for the helper. It would be a tough feat to achieve, let alone do so with such ease as the young man before the door, breaking through with a mere wave of his hand and without even a frown.
In this matter, the most authoritative voice here belongs to Hua Zhenyu, the Family Head of the Northwest Hua family.
As a disciple of the three high-ranking Great Grandmasters in the room, Liu Ping, Hua Zhenyu chose to submit to the Liu family precisely because Liu Ping promised to help him break through to become a Great Grandmaster. Indeed, Liu Ping had fulfilled that promise.