There seems to be some incongruity between Tome of Blood and Tome of Fate
First of all: a sickle sword and a khopesh are the same thing.
In Tome of Blood we have rules for Sickle Swords. The description and function of these blades is an exact match to an Egyptian style khopesh (with the big hook on the end) so the in universe sickle sword matches the real world one, based on the description..
In Tome of Fate, we have some powersword versions of the khopesh. Yet these have totally different rules... but the only difference is they have a power field.
Since a sickle sword and a khopesh are the same thing, why does it loose all it's other bonuses because it has a power field? I can follow the logic behind the difference between the Castor and Pollux ones, since they did come in larger more axelike forms and smaller slashing blades, but the blade does not change shape, and it's the shape of the blade that is what lets you disarm people with it.