Obi-Wan will be able to sense a feeling actually not unlike the Force itself from the Xunutane, as if it were part of a much larger web.
The natives are generally as susceptible to it as the kedan are, in that some are more aware and resilient, but others are easily manipulated. None of the races have any sort of telepathic acumen or shielding. Just keep in mind that the 10-NPC rule applies to the landfall natives as well as the kedan, in that Obi-Wan can't affect more than 10 of them without mod approval.
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The natives are generally as susceptible to it as the kedan are, in that some are more aware and resilient, but others are easily manipulated. None of the races have any sort of telepathic acumen or shielding. Just keep in mind that the 10-NPC rule applies to the landfall natives as well as the kedan, in that Obi-Wan can't affect more than 10 of them without mod approval.