Wow, I did not know about that quote above the dwarves in which they are said to have no spirit (soul? Now I am imagining creepy soulless robot dwarves XD).
A good thing Bilbo can defend them here, and Rumil is in for a surprise when he meets his first dwarf at last, I'd say!
A really like your characterization of Rumil here - he still has a scholar's curiosity - and shows respect for that same trait in Bilbo - but there is also that slight air of arrogance of one who has seen much and maybe become a little too confident in his own knowledge.