If you look at the dubious characters that yhe Roosters built their prolonged success on 10 or 12 years ago (Maloney, SBW, Jennings, Fergo etc) it’s hard to work out who has the right character traits.
A strong club with strong culture will be able to handle dubious characters somewhat. But usually they end up somewhere else pretty quickly.
The issue is when culturally weak clubs that are easily influenced sign these players out of desperation - and more often then not on overs.