Thats not always the case, Ajinkya Rahane is pretty good in the IPL and hes a small and not really a powerful man, but he still gets runs. If you're talking about the last few overs hitting then you could at least time the shot and find the placement and elevation. Kohli finds the placement all the time in T20 cricket and he is succesful. Sixes are not everything in T20 cricket, dude. You can get a good score also by running hard beteween the wickets and time the ball and finding the placement.Potential not power, which is required in T20s.