Joshua's discovery regarding what he was capable of, thanks to his inclination, was pretty startling. And Toz almost immediately thought that if Joshua was strong enough, he might be able to steer the entire island by taking control of the island's barrier bubble. However, those thoughts only led to the realization that it would take a lot of time for Joshua to reach that level, and they would still have to be stuck on the island of trees for it to be of any use.
After Joshua figured out the workings of his inclination in more detail, he told the others on the island about it because he found it neat and wanted to share his discovery. The only thing that slowed him down was leaving the bubble he had unintentionally trapped himself inside. However, once he got the hang of it, he could easily make himself pass through the bubble again. And just to make sure he actually had it figured out, he tried going back in and out of the bubble several times.
