Di Tou was stuck in a conundrum. Of the three possible asks, he was naturally the most interested in leads on other worlds. Most ideally, he leads regarding the world he came from, but he wouldn't know how to ask for that or how to verify that to begin with. Even if the information or a method regarding how to connect with the earth was right in front of him, he might not be able to recognize it, how sad was that?
This wasn't just only the item he was the most interested in, but also the one that was arguably the most exclusive to the Academy. Although Di Tou had no doubt there were dozens if not hundreds of sects out there with ample research regarding other world fragments, and possibly even the universe he came from, he wouldn't know where to look regarding such a thing. Who knew if it was sect A, sect B, or sect Z.