graviblog640115420 March 25, 2014 3 Questions, Uncategorized 3 questions with the COO of Rüster Sports graviblog640115420 March 25, 2014 3 Questions, Uncategorized Meet Ethan Davidson, COO of Rüster Sports. Connect with this Des Moines resident at Green Grounds Cafe in Valley Junction each Wednesday at 9 a.m. during 1 Million Cups.