Theoretically, if the Precursors or Flood was able to trap or destroy the Traveller with a Star Road, wouldn't the Guardian's be robbed of their light? Same goes for the Dreadnought and Oryx.
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The Dreadnaught is several times larger than the infinity, with a cannon that can wipe entire fleets in a single blast, not to mention the fact that Oryx would likely "Take" the Infinities' crew/anyone who tries to board his Dreadnaught