Added a picture
http://hkmdb.com/db/movies/images.mhtml ... ay_set=eng
I changened the old order cause the lead actor is placed on Pos.6 and this looks like supporting actor Dai Sai Aan plays the lead. Strange! Who did??

The old order was:
1 Dai Sai Aan
2 Jason Pai Piao
3 Kan Chia Fong
4 Phillip Ko Fei
5 Thompson Kao Kang
6 Ron Van Clief

I often see extras placed over prominent roles - so why not change the No
when adding a prominent role just because the extra is well-known maybe 10 years later...?

This is because the editor who added the first cast did not know read chinese, so he added the actors he recognized.

Later appeared another editor who does not recognize the actors but can read chinese, and added the rest of the cast from the credits screenshots without knowing if they are more prominent or not.