Visible crew/equipment: While Talyn is flying towards the sun and everyone's screaming Talyn's name, we can see the puppeteer's arm going up into Rygel's sleeve at the left side of the screen.
Visible crew/equipment: When Stark and Sierjna go to Talyn's rudimentary pilot's den, notice that Stark's vest has suddenly developed five randomly placed grommet openings, which will be where Talyn's wiring will attach when Talyn bonds with Stark. And when Stark-Pilot says, "Talyn you will turn away, you must turn away," there's boom movement at the right and left of the screen. Also, later when Stark-Pilot flies Talyn closer to the sun to rescue Sierjna, and once she reappears, there's a shot from behind Stark-Pilot and we can see the long rod (not Talyn's wiring) that's behind his right leg attached to his pants, which is part of the support equipment to have Stark-Pilot hover.
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 ★