Jia Lin's intentions from the get-go weren't to use the Sealing Mark and the Vessel Control to once again lock away the demon. No, if he did that, then all the power and knowledge that he had acquired would be lost and he fully well and knew that he wouldn't have gotten the chance in the first place either.
Demonic Jia would've stopped him before he could even get the candle to appear, not only that but with all the experiences Demonic Jia possessed, he had long thought about the Sealing Mark and was also waiting for Jia Lin to attempt it. If he did, Jia Lin would have to form several seals in order to get it to work and he would take that chance to finish Jia Lin off for good.
Thus when Jia Lin was fighting against Demonic Jia, he was thinking about various ways and means to get the upp
