This is still a bad outcome no matter what happens; masquerading as mafia as ultimately led to Visor being outed as a town investigative role... even if we call his ability to scan DJ favour as a bit 'meh' (that's open to discussion though, I think it has it's uses), the mafia still have a power role to target over the coming night phases.
If you see no merit in his claimed ability, it's better to follow through on the lynch to be certain that he's not playing a Xanatos Gambit... I think that if we pooled together knowledge of what the goals are for each level of DJ favour, his ability would gain more use.
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