I haven't seen the pic of Hohan Soken holding kama mentioned but I would imagine that it's pretty hard to conclude much from a still pic or pics. One tech where the user punches, using the blade point as the weapon requires the grip to be just below the blade. For swinging "penetrations" like an ice pick, the grip usually slides down the shaft to leave about 1/2 an inch to an inch of the handle protruding from the hand. Still, the manner in which Hohan Soken holds them may be particular to a style or his own way of doing it. Kusarigama from what I've seen [and my experience is by no means exhaustive] would seem to be a mainland Japanese thing, while "nichogama" seems to be an Okinawan development.
The dreaded two small coins....
Lurking in dark alleys may be hazardous to other peoples health........