Tait sucks man. Put him in a test match and let's see him bowl at 160 throughout the day.
Guys like Steyn and Morkel could also hit 160 if they only bowled in one format.
Big guys like Morkel and Mcgraw never focus on speed, they always go for movement, because of their height the generate more bounce and speed naturally, and besides playing a length ball is harder then a 160km/h flick it for 6 if you see it ball.