See what I always found funny is brian will say that, but then a friend of mine has cinnies directly from him and all of them are like any other ball python, not aggressive at all and he has atleast 7-8 cinny/cinny combos produced from brian's stock.

Brian also has a episode which he tests a theory we all already know, which if you handle an animal, it will be tamer.

I still say their just individuals. I also think how they are brought up plays a big roll also.