Before leaving, Laz checked out Dwayne's issue with cultivation. If Laz was being honest, he was probably not the best person for this task. After all, he wasn't some all knowing sage. The only benefit he had was his experience in treating Sarah and Abraham along with his own efforts. Luckily though, he didn't let Dwayne down.
As it turned out, while Laz had always been using the technique he created which regulated the flow if energy through the body, there were different ways he had discovered that worked just as well. But since they worked just as well as far as he was concerned, he just went back to his usual way. It was only now, helping Dwayne, that Laz understood and appreciated the other ways he had discovered.