Definitely not at first, but remember that Herbert didn't planned next books at all, he just wrote with the flow, hence some characters take weird twists between the books. Especially Duncan as Hayt was serious as fuck, but something snapped after his hilarious death scene and when we see him next in the God Emperor he's already quite funny.
I just think it’s funny as fuck. Like I can’t help but think the whole character of Duncan Idaho was intended as very low key comic relief.
Definitely not at first, but remember that Herbert didn't planned next books at all, he just wrote with the flow, hence some characters take weird twists between the books. Especially Duncan as Hayt was serious as fuck, but something snapped after his hilarious death scene and when we see him next in the God Emperor he's already quite funny.