didnt u see umar gul. although we havent seen gul/gayle battle but kallis/gul hav much to tell
Lee is not on top of his game right now and was not able to get it right.
Fast bowling is not about pace only but technique as we all know (Unless its Shoaib Akhtar). Lee was not doing much with the bowl and was trying to bowl fast and thats why Gayle was able to hit him hard.
If you look at Mohammad Amir, who also has good pace. He was pretty economical in the first 6 overs against some of the very best openning pairs. And your highest Wicket taker of the tournament is also a fast bowler who is able to reverse the ball after 12 overs.
So i don't think T20 is killing the Fast Bowlers its actually developing them to think more and have more variety and that too with good accuracy.