"that cricket guy" is Don Bradman and yeah he should be top 5 on any GoaT list. Ali, Gretsky, Jordan, Bradman, Federer
That said, if you accept that darts is a sport Phil Taylor has to be in the argument, but personally I like to pretend it isn't one because XFD darts.
As for the topic my first thought coming in was Billy Mitchell so him I guess.
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XIII_rocks, the cream of XIII fanboyism.
The guru champ isn't such a SuperNiceDog, he made me change my sig!