I always think that Mo Greene analyzed Ben Johnsons technique, adapted it to himself, and made it better. Remember when he said, in Sports Illustrated interview, that he watched Big Ben on his big screen plasma many times. Maybe through the Smith structure(more longer runs-300's and steady diet of 200m training runs/competition runs, he had to relax more which made this type of stride, "Big Ben long stride"(A stride that is difficult to maintain if one ain't powerful enough and well co-ordinated), into the more superior, "Mo Greene long stride"
As well I always think that Asafa Powell analyzed Tim Montgomery technique, adapted it to himself and made it better. Stephen Francis said he showed Powell videos of Boldon and Greene but I see more of the Tim Montgomery short-man style in Powell then I see the long-striding style of Boldon and Greene. When T.Mont and Powell run with this short-man style the things that u visualize initially and mainly are the fast frequency combined with the low heel recovery and apparent high knee.
With this short-man style, T.Mont. could only maintain it for about 90 metres before he fell apart. But when u watch Powell use his short-man style, the guy can maintain it for a full 100 metres as well as nearly a full 200m race. In 2004 he would fall apart at about 170-180 metres, whereas now with his multipe 9.77 speed reserve at 100m, I believe he can carry this technique for a full 200 metres. I think his 2006 19.90 200m run lends some credibility to my last statement, as eye-witness reports have Powell going thru the 100 mark on bend in 10.4-10.5 range and then exploding from 120m to 180m to where he then eased off to this 19.90