To throw in a few obvious stand-out names to show that it's not at all outrageous to leave him out of a top-20...
Marshall, Hadlee, Imran Khan, Lillee, Donald, Wasim Akram, Ambrose, McGrath, Shaun Pollock, Bishop, Garner, Holding, Roberts, Hall, Adcock, Davidson, Statham, Trueman, Miller, Lindwall. One could also make cases for Alec Bedser, Fazal Mahmood, Peter Pollock, John Snow, Waqar Younis and possibly Jason Gillespie.
There are also others from the 1900s, 1910s and 1920s (possibly not 1930s) who may have a case but whose cases I'm not familiar enough with to make much of a claim about.