Cormier has a more compact boxing style, which has its pros and cons.
Stipe won't have the option to safely box at range against Ngannou and his 83" reach. He has to take significant risk for each significant strike.
If you think Ngannou is technically weak, you're missing something. He has deceptively good footwork (when fresh), his counters are fast and accurate and his ability to chain power punches is unique in the division. Yes, when he moves forward he is often telegraphed but that's not all his game.
What I wonder is what happens if/when Ngannou start throwing the leg kicks he used against JDS and Blaydes.
Does Stipe catch them and get a TD? They're fast and upward so not that easy.