The problem with Jones' theories is that they center around this erroneus notion that you either have specificity or you don't, that there are no levels of specificity. Take tennis for example, there is singles and doubles. Now, I can assure you, singles and doubles are 2 totally different games. Take 2 singles players that have never played doubles before and have them play a good doubles team and they will lose horribly. Now, take 2 people who have never touched a racquet before and have them play doubles against the 2 singles players. Assuming neither team has played doubles before and that there are no levels of specificity, both teams have the same chance of winning. I can assure you this is false.
Now, with regard to performing individual movements. Take a gymnast performing a bar routine. A gymnast does not learn a bar routine by grabbing the bar and performing a full routine, they break down the routine into portions and they do it that way, otherwise they would kill themselves. If there were no levels of specificity then this would be the wrong way to go about things and you would gain no positive efefect from training this way, only performing the routine from start to finish would be an effective method of training.
WRT explosive movements, it is not strength you are training when you are doing explosive movements, it is enhancing the stretch-shortening cycle, similar to what you are doing with plyometrics. There are tons of studies supporting the use of plyometrics and here is an article on plyos.
http://gladstone.uoregon.edu/~j15/lr/lr_index.htm