Ok, this one has bugged me for quite some time.

The ghost step ability renders the ninja invisible for one round.
The ki dodge ability (aquired 4 levels later) grants him concealment (20% miss chance) for one round.

They both cost the same and have the save activation time. Except that ghost step grants you full concealment (50%) as is gained earlier.

So what's the point with ki dodge? Is it there exclusively to bypass the see invisibility spell?