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