Although sometimes there might have been minor errors – but this was likely related to the computer's calculation algorithm (rounding of values, glitches, etc.) – highlighted in red.
But below the Medusa's rank, I cannot guarantee the values – there is no data, and I don't see any pattern. The Ogre from the basic table doesn't fit into its place, and what's in between is unclear. Let those who like to play at 80% (or who have data from such a game) complete the table.
And finally: the actual combat abilities of monsters may not correspond to the rank in this table – this is the rank for rewards.