Zhang Fei Xuan and Wang Qizheng were indeed talented.
Song Yin was very clear about this.
Although they had no talent for learning the Human Elixir Technique, they could blaze new trails by developing the Blood Elixir Technique that used Blood Qi as the medicinal basis for refining their own bodies, and the Beast Elixir Technique that used beasts as medicine to strengthen themselves. This was a sign of great talent.
They had reached the Fourth Stage, far surpassing their fellow disciples, and their diligence was not lacking either.
But they were lax and languid, and as the second and third disciples, they had no one to supervise or guide them.
As for the early death of the Big Senior Brother, Song Yin didn't know who he was, but he guessed he was probably the same as them. After all, their master had never bothered with this matter, which had led to their current situation: the realm was sufficient, but their methods were lacking.