Ooooh, I've read about that tower shortly on the wiki. That's a good overall plot. =P
Aaand I've gotten an idea.
I'm imagining some sort of meeting place for mages of all sorts. In the back of the room, a loud character can be heard talking, laughing, and flattering several mages to the best of his delight. Alas, he leaves the place with a uncertain smile. He didn't get what he want. What he wants is a group. What he lacks to get said group was motivation. That was when he met Angelo. During their conversation, Angelo mentioned something about a 6th tower - a mystery no one had been able to solve. This was the motivation he had been looking for! Slyly, he asked if Angelo wanted to go find it. "Even if it turns out to be false, what better way to make an entrance into the world of mages?"
With that hook, he somehow managed to scavange a small group. (Either over the course of days, weeks, or the like. Perhaps via help from others in the group)
And although James spoke loudly of this investigation, he just needed something to bait people. While he thought it to be cool, he himself thought the entire idea to be ridiculous - although he never said so to anyone, even if some might've gotten the same idea.