Ordinary puppets and human control techniques, like when Tao Qian was young and weak, used an alien object to control an avatar called "Situ Fei."
Such methods were of no use to beings of Zhou Yingchun and Qin Wuxiang's caliber. Even the Heavenly Demon Pill and Evil Worm that Tao Qian later acquired were equally ineffective.
Even if he miraculously succeeded, he would certainly not be able to conceal it from the old monsters within the Seven Evils Sect and the alchemists.
Tao Qian temporarily had no solution and after asking around, the other Talents didn't either. It was Lin Bu Jue's cultivation method that had a Secret Technique which might work, but that required Lin Bu Jue to advance to the Cavernous Mystery Realm, which was presently unachievable, even to assist Tao Qian.
They were all ready to give up, but Tao Qian seemed to think of something, and after saying, "Let me try something," he parted ways with the others.
