Who is Frank Ache from Deal Breaker and what is their importance?

Frank is Herman Ache's younger brother. The Ache brothers are like two sides of the same coin. Frank is shaped like a pear and has small shoulders. Facially, the two brothers look alike, but this is where the similarities end. Frank is bald and does not bother with toupees. His teeth are "black with spaces between them" (pg. 220.) When Myron meets with Frank and his brother, Frank wears a "powder blue sweat suit with neon yellow trim" and wears no shirt. His pants, the narrator remarks, are "a few sizes too small" (pg. 221.)