Besides, Mo Wen's speed was accelerated due to the help of the three Glory techniques. It was not a release technique that he had mastered. If one only took into account release techniques, Mo Wen could be considered a newbie. Without the three Glory techniques, Mo Wen was weaker than ordinary beginning stage Primordial Soul Realm practitioners.
Hence, Mo Wen needed to practice a powerful release technique now. If he mastered a release technique, combined with the help of the three Glory techniques, Mo Wen's speed would most likely increase by a few folds.
However, Mo Wen did not have access to any release technique that he could practice, and it likely wouldn't be simple to acquire a good release technique.
...
Two weeks before, after Mo Wen escaped, it took only two days for Ku Ji to reach Li'an City. Ku Ji intended to meet up with Mo Wen, yet he received the news that Mo Wen had escaped from the city due to a kill chase.