The dual cultivation of the Silken Bond Technique assigns the faster progressing individual as the Silk Puller and the other as the Silk Extractor.
The better the aptitude of the Silk Puller, the quicker the breathing and energy refining speed, which is entirely unrelated to the aptitude of the Silk Extractor.
If one were to make an analogy, the Silk Puller is like a car engine while the Silk Extractor is like the car's tires. Once the engine starts, the tires don't need to do anything; they just follow and rotate—that's it.
Of course, since the Qiansi Sect specializes in puppetry techniques, naturally, some have developed the Puppet Substitute Cultivation Technique, allowing puppets to serve as the car engine.