Ah yes - "I am rubber, you are glue". Given that this is a hypothetical, and I have no stake in the outcome, I think it is reasonable to conclude I am not being emotional about this.
> People who thought of themselves as great but were diminished by others for being fools are easy to find in history of science in particular.
And how many claimed to be great that are not in the history books?
And why would you assume that ? If you hand no stake then I'd say it's far less likely to go for descriptions like hubris or ego. I have no stake in chess and I wouldn't call Kasparov anything like that but people more invested in chess certainly do because it's closer to heart for them.
> And how many claimed to be great that are not in the history books?
We don't know, because they're not in the books. But seriously, how exactly does this matter if you are just searching for logical support ?
Therefore, logically, if someone claims to be great, they are mostly likely riding high on hubris and ego. It's statistically the most likely outcome for anyone claiming greatness.