i think his plan is to get his bully's kid to get bully ruining them but also collect all the evidence of bullying to ruined the bully,
so not only does he get his revenge by getting his bully's kid bullied but the bully get ruined by all the evidence he collects
this could end right here and i would be happy if it wasn't for the whole stuff about some dragon trying to get a lord to be raised
if that plot point wasn't there it would of been a good ending to the series imo