I haven't read this whole thread all the way through but I will say I think Williams is going to do well for three reasons.
First, his motor appears to be very high. Almost like the Big version of Smart.
Second, he also appears to have a high IQ.
Third, he's already shown great leadership qualities on and off the court.
I understand he isn't the ideal size for a guy at his position, but I really see him being able to have a similar type of role as Draymond does. I don't think he'll be as good as Draymond, but he seems to have similar qualities to him that Draymond has.