This had better not be just a rumor.
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I'm wetting my pants as I type.
Having read everything up to chapter 221 (translated by the ever-awesome Saiki, thanks a bunch!) in manga scans, it's more obvious than not that Skull Knight is guiding (more akin to leading) Gatts for a larger, as-of-yet unknown purpose.
For one, it was Skull Knight who first tells Gatts the...