I know, but it's just odd that they would tease him joining at a time when they knew they were sending him down to Mexico. Why bother?He's gotta go on his excursion abroad like everyone else. It's a tradition in Japan once you're no longer a young boy you go on prolonged international trip to learn more, develop physically, and come into your own as a character. He won't join IGBN now as he'll likely be gone for the better part of two years and they might not even exist when he does. If they he'll probably return and join just like Okada in CHAOS.
Unless it was to get us used to those kind of teases with other people.