Criticism #1: the Waff ghola

Being the book I just finished, Sandworms of Dune criticisms are closest to my head. In this novel, the character of the Waff ghola is completely useless. This character does not contribute anything to the storyline nor does any of his actions.

He creates the sea worms. Why? What is the point of the seaworms? They create ultra spice, which is used once by the False Paul. Later, Waff returns to Rakis, fails in his experiments and then sees the worms return from some kind of shell deep underground. All of this could have been taken out.

The False Paul could have simply taken an overdose of regular spice, and then we could remove Waff, all his subplots and then simply make note of the return of the worms at the end. The character was not interesting and contributed nothing to the novel.