Just finished the book, and I too subscribe to the theory that there is more to Humble Measure's motives than just disliking Malazans. I think he was playing a much deeper game my reasons:
- There was much reference, by Seba Krafar for instance, that there was something incredibly dangerous about Humble Measure. Admittedly, Seba is no Rallick or Kalam or Vorcam but he *is* Head of the Assassins, and if he thinks Humble Measure is not to be messed with, then I guess we should believe it.
- When Fisher buys off the contract on the Malazans, he tells Seba that if he knew the reason behind Humble Measure's actions then he "would not be so eager to take his coin, no matter how much he offered" (page 616). So, clearly more than just a dislike for Malazans
- The Darujhistan storyline is clearly not over. Karsa is told not to leave, the Tyrant has not yet arrived although Baruk says people in the city are working to awaken one, unexplained pickled Segulah in K'ruls belfry, that whole unexplained thing where Baruk sets his demon to guard/watch that ghost Hinter.
I just reread the first scene with Humble Measure (page 75) and actually it does seem that hatred of the Malazans is his reasoning, more specifically:
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Darujhistan would not fall to the Malazan Empire - he had found the means to ensure that. To ensure, indeed, that no foreign power could ever threaten the city he now called home, ever again. (TtH Hbk, pg 76)
followed closely by:
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His thoughts were on such matters even during the day, and this day in particular, when his most loyal servant - the only man who knew of the secret crypts and, indeed, of Humble Measure's master plan - entered the office.... (page 77)
And finished off by Kruppe's end of chapter summary:
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In another part of Darujhistan, a merchant of iron dispatched yet another message to the Master of the Assassins' Guild, then retired to his secret library to poer once more over ancient, fraught literature. (page 91)
So, HM's plan is bigger than just wanting to get rid of the Malazans in K'ruls bar. He wants to stop *anyone* ever invading again. He has secret crypts, presumably with dead bodies inside. He is reading ancient scrolls. And he has a grand, master plan that would make even the Assassins' Guild unwilling to take his money. Oh, and Baruk says people in the city are trying to awaken a Tyrant. I think we can put two and two together here. Maybe killing the Malazans was part of the spilling of blood that seems to be needed to raise/summon such a being.