You're right in him being rather obsessed with catching Kellus; there'll be a bit of story-time coming up after Kellus is birthed that'll give their background and why he's chasing after him.  Also, strictly speaking, there are other ways of gaining energy from those that we've caught/enticed/etc, some of which Kellus has already touched on.  It's not nearly as friendly as Jaku's method, but if you need someone gone for good, it's about the best way to ensure that.<br/><br/>On the subject of the humans in the RP; I personally don't care too much either way, but as Tamara pointed out, simply writing them out at this point after the fairly major role they've had thus far would be rather abrupt.  This would also mean removing Chimera for the most part, as they're predominantly human (that we've seen thus far), and unless you want my group to take over the role as the primary antagonist, we should keep Chimera around if for no other reason than a relatively easy access to food.