In another life I used to own the very long version(until it was stolen), you can see the handle and the bottom of the sheath/wire cutter down below my pouches.
In the image you can see that I had the top part of the sheath bent right back and down so it exposed the handle and was easier to draw, it also meant that it could be higher up the on the belt which was a better way of carrying it with it being so long.
The blade was easily held firm by the sheath, I think it had some kind of spring steel inside to hold the knife firm, you could see the 'rub' marks on the blade.
It was a good piece of kit, not a lot of use for anything delicate but it was a heavy blade useful for chopping and the length gave a lot of leverage when using the wire cutters.
I have a small collection of knives and wish I still had that one.
Just looking at your images again and you can see the same rub marks on your blade.