The chasm between Test cricket, and even ODI cricket, and T20 is becoming even wider.
There's a clear difference between the 'hitters' - men like Brathwaite, Sammy, Gayle, Bravo, Simmons - and the 'shot makers' - players like Kohli and Root.
You could argue the former two are the better players, and I'd definitely rather they were in my team, but too many sides don't boast the hitting power to rival the Windies. Not many nations can clear the ropes with ease like WI can.
It's the same with bowlers. Wicket takers are relatively superfluous in T20 cricket, because a team has such an abundance of players and time to play with. You rarely see a team entirely dismissed, because their order usually bats well and deep. That's why bowlers like Willey are more effective than Amir.