Or even more similar to the four tomes of Chaos in BC. (Where power creep is apparently highly sought after!This indeed could be a good way to replace the inquisitors handbook by 3 big ordo tomes.Each one should have around 250 pages though, similar to the IH and Radicals Handbook.
)
4 ? Hah - I am still waiting for my favourite one ! I hope it sold well enough to make it possible to finish grandpa nurgles tome.