Well, we know Jukashi can draw heftier characters well enough. Klen here looks like he has around twice Ten's muscle mass.
I think Ten simply doesn't want to bother with the extra bulk. With more space beneath his arms he can carry larger barrels of booze.
Ribus, your excerpt has helped me realize that Karen's caste mark morphed into Cross Popping Veins (see TVTropes) in that last panel. Another sign of Jukashi's awesomeness.