Maybe a few videos will help.
Oki Kebari under water
https://vine.co/v/hulYFvT1Y9t
Sakasa Kebari Underwater
https://www.youtube.com/watch?v=_Cflrh-c7eM
Sakasa Kebari Underwater Hackle Comparison
https://www.youtube.com/watch?v=r3dkf7LNviA
Do they look alive or at least lively? And perhaps more likely to attract the attention of a fish watching for a meal.
D