Visible crew/equipment: During Kcrackic and Rygel's Tadek game, after Zhaan tells them they have nothing left to bet, when Rygel wagers Moya we can see three of the puppeteer's wire cables running up Rygel's sleeve.
Visible crew/equipment: Near the start, while Rygel's annoying Zhaan and D'Argo by banging the noisy Y-rod against the Tadek board, when Rygel says, "It may be preferable to this mind-numbing tedium," the wavy dark hair of the puppeteer can be seen behind Rygel. Then later, when Zhaan says that she will strive to keep Kcrackic distracted, as Rygel's smoking the hookah we can see the movement of the puppeteer's arm under Rygel's robe.
Chosen answer: It's never explained. John mentions a theory that his less technologically developed craft simply interferes with the wormhole less than the "superior" Vipers, but they never make a concrete determination on that point. But we also have to take into account the fact that Moya traverses wormholes with no ill effect as well.
Garlonuss ★