Cy, Dent, Jamison, and Blystone were all excellent!
I'm surprised no one said anything about Emil Sitka. He was one of my favourites.
He was awesome in Brideless Groom, Gents in a Jam, Vagabond Loafers, etc...
I'm not sure how many he co-starred in, probably not as many as Vernon Dent because he was in some Early Curly's and Shemp's. He was a good friend of Shemp, and played off of him very well.