FB, to your question - "What is the measurement of?, I think, as H said, it will be measured by Mimara through the Judging Eye. I have a feeling that no matter the atrocities committed by Kellhus and his utter ruthlessness to act out his plan (TTT), it will ultimately be seen as holy through the JE. Why? We'll, we've seen two character with haloes, Mimara and Kellhus. We know Kellhus's helped are not Sorcerors in nature and might be a product of what he becomes, forgives and made Holy through Mimara a la the Judging Eye.
These are just my thoughts, though I think there is textual evidence for that to be the case. We've been thinking that Kellhus is damned, Well because, He's a sorcerer, a mass murderer and so on. But, no one knows his true intentions and I think the Haloes are a clue that at some point he will truly be holy. My guess? The destruction of the 100 and giving control back to the God.