In fact, it was by coincidence. When Lin Chang'an initially hadn't yet broken through to Tier Three with his puppet technique, he naturally started with corpse refining. Only after his skills advanced did he incorporate the puppet way.
"I am willing to exchange this corpse puppet technique for some materials to refine Nascent Soul spiritual objects..."
Sure enough!
After Lin Chang'an frankly stated his purpose, the Grand Elder smiled and nodded.
Though the corpse puppet technique is precious, to a Nascent Soul Influence, it's just average.
The Myriad Poison Sect has an abundance of Hundred Skills of Cultivation, but ultimately it relies on its sect cultivators.
Yet within the Sect, there's more experience in the Path of Beast Taming and control techniques; who would seek harder paths when easier options are available?
Not everyone is a genius.
