Archer has thrown a change up an avg of 7.5% of the time in his career (12% this year), Duffey 2.1% last year and 6.7% this year (the fact that the changeup isn't good, probably plays into him getting lit up) Not sure where you got Wacha from, he throws a Fastball, Cutter, Curve and Change all > 10% of the time. Detwiler; FB, CB, CH all > 10% of the time (and he stinks, so not sure thats a good example anyways)