Who is Iyo Kobat from God Emperor of Dune and what is their importance?

Iyo Kobat is the ex-Ambassador from Ix, banished after Idaho's attempt on the God Emperor Leto II's life using an Ixian weapon, Kobat appears at a rebel meeting without mask and is forced to take home a copy of the books Siona Atreides steals from the fortress, along with orders to translate the material or be revealed as plotting to defraud the Guild and Bene Gesserit with impossible plans to develop a mechanical alternative to spice navigation.