Those who encountered the Homeloss would inevitably establish a "connection" with Duncan, and from another perspective, Duncan, the "Outsider," indeed needed to build such connections within this world as well—only by mastering as many channels of knowledge and support as possible could he further understand this world, the Transcendent realm, and even... understand himself.
Morris and others were brought aboard perhaps out of urgency, but even if they hadn't boarded today, Duncan had plans to expand his "influence" in this world, and in his view, the few individuals now gathered on the Homeloss were indeed suitable candidates.
Morris, an outstanding historian and scholar, a Believer of the Wisdom God, possessed valuable knowledge, which was exactly what Duncan was currently lacking. Moreover, this gentleman also had a certain network and status in the civilized world as a "high-society" figure, which could prove very useful when the time was right.