If Gadky killed Nebo, the responsibility for informing us about this lies with Nebo himself. However, now it could also be disinformation; we're talking too much, gentlemen.
If someone else visited Nebo, the responsibility for this lies with someone else. At least an alternative version should be offered.
And the bandit's defense works differently; in that case, the responsibility lies with Revan, who will tell us about it if necessary.
That's all...