It does indeed look like Jaelnec is losing his grip. I truly wonder if the companions (and whoever else gets involved) can actually cure the Withering, because not only do they have to overcome the enemies that bar their way, but I fear they may just be crushed by the corruption within. After all, Jaelnec is not the only one with some grave issues (and, looking back at how he was at the start of the RP and what he's become, there's a good indicator of how much went wrong and is wrong with the group).
To refer to Jill and Gerald... hm. Renegades or outcasts would describe them, as would mages or sorcerers. Selfish bastards might apply as well. I suppose a better title could be found once we have a better idea of what they'll be trying to accomplish (which will probably mostly depend on Gerald given Jillian's general aimlessness).
Edit: I don't actually know how Harvesters are created, so why exactly is Aemoten more likely to become one, other than simply existing for longer than other mortals (and if it is a low-percentage chance every so often for any person with a soul, he would then simply have more chances to hit bingo)?
Actually, have I got that right that Harvesters have no soul, and want to make others like them (that is, bereft of a soul)? Would explain why Aemoten would become one if a Harvester got him, since he won't die from it?