I’m quite sure the Cryptic Hero title is account-wide, meaning it can be equipped by any of the characters under the same battle.net account as long as 1 toon has gained the title. This could explain the named toons having the title despite having lower personal ratings.
The update was posted by the Blizzard Community Manager, an official source thus.
You should mouse over the small triangle warning at RaiderIO. It is not an official source.