To be fair he’s gagged and and apparently in the middle of silent tantrum so he’s not very communicative in this scene, though even later when he’s back on his throne and even during Stormcloak questline he’s not very memorable too, you mostly talk with Galmar Stonefist who is more expressive. I guess it’s explained officially by him being apprentice to Greybeards and wielding some degree of Thu’um, you just don’t flap your gums carelessly when you can demolish everything around you accidentally.








No, actually not, except Arngeir who is the most proficient in Thu’um, even they risk releasing the power. Or maybe they just got used to silence after decades of maintaining it. It’s actually indicating Ulfric talent and control he managed to become warlord and politician despite it.
Yes but it’s because both of them are actual Dragonborn for which dragon language is no problem, but Greybeards including Ulfric are normal (if talented) humans, for them learning and controlling Thu’um is much more difficult.