The original Jun Moxie would've used the same means as Tang Yuan if he had faced a similar situation.
The present Jun Moxie and the previous one were very different from each other. Jun Xie was an evil spirit, and was also regarded as a 'free bird', but his bones weren't made of the same debauchery that consisted Tang Yuan and the original Jun Moxie's. Jun Xie had always relied on his own self. In fact, he wouldn't even alert the police if he were to spot a vicious crime; he'd treat the evil as his own enemy and would deliver justice himself.
The original Jun Moxie had a habit of oppressing people using his power. He would use it to push them down. These two people had such different characteristics; so, how could they be so easily integrated?