I'd bet against him being relevant to the Godsmoot. The tie vote at the Godsmoot seems like a plot point for the events of Utterly Dwarfed but not relevant to the comic as a whole or the last book in particular.

Start of Darkness talks a bit about the Dark One's ascension to godhood, and it looks like you need a lot of mortals believing in you and dedicated to your cause. Belkar isn't really a leader or influential beyond "you're afraid of me if you're within reach of my daggers" so that would be a hard barrier to surmount.