Like Spock, it appears that Cuhlecain has set himself up to be hoisted by his own Picard. I'm pretty sure that's how that saying goes

That said, I'm wondering if Cuhlecain deliberately set up this entire scenario simply so that he would have the service of an exceptionally skilled assassin. With Eesham and Xarsien's lives on the line, Renauld's forced to do what Cuhlecain commands for what is potentially an indefinite period of time, and considering his skill then Talos is in real danger.
Still, seeing as the general has managed to anticipate this, it seems that a lot hinges on springing Eesham and Xarsien before Renauld gets to him. As it is, Renauld seems desperate enough that Talos' dragon blood might not be enough to save him.