[quote=@tobiax]
It was a Champion, but by the above logic, the attack should be weaker if it's from a Rookie than if it's from a Champion. Since that doesn't appear to be the case, I'm asking if it logically follows that Bakumon's Nightmare Syndrome would work the same, because it's the same as Digitamamon's Nightmare Syndrome.
[/quote]

It was still Champion level, but to clarify the reason for that is entirely due to the card effect. In the case of Bakumon since you didn't use any cards on it yet then I have no real reason to believe it was anything stronger than Rookie level, hence why would have minimal effect on the Cyber Beast. Also the Cyber Beasts themselves are anomalies that sort of break the conventional rules, so this one will be ruled as inexplicably immune to debuffs due it's glitchy/buggy nature.