Rowan had ascertained that the journey would most likely last a month and within that time frame, he would have grown more powerful, and if he could escape from the Planet using the Teleportation Station, then there was really no reason for him hiding himself from the convoy.
But he could not allow details of himself to be sent to Trion, else this planet would become too dangerous for him to grow.
Rowan had unknowingly saved himself from a far worse fate because he wanted to stop Scarvros from reaching the Underground City, not knowing he was already a wanted man in Trion and Scarvros had recognized him.
Part of the reason he could not imagine this outcome happening or how quickly he became a wanted figure was because he was sure the organization that built the Nexus—The Order of the Broken Eye—was a very secretive one, and Rowan thought that they might choose to quietly hunt for him.