There are 2 ideas I have that support this theory:
1. They speak in the third person. This means they view them self as part of a collective, making them have strength against IS NOT attacks.
2. They were made by Azura to "set the moons back in their courses". And the Numidium is said to have the power to "knock the moons out of the sky"
Numidium is also more Padomayic from it's deep connections with Lorkhan and it's IS NOT.
Kahjiit might be more Anuic with their ability to keep Lorkhan's rotting corpse in check, as well as the hint that the Kahjiit must "climb Khenarthi's breath," and what climbs Khenarthi's breath other then dragons? Which brings us to Tosh Raka, then dragon cat which name is an anagram for r-Akatosh. If the Ka Po' Tun have any real connection with the Kahjiit that is.
So, the Kahjiit should be able to mantel Akatosh and defeat the Numidium and fix its damages.