The Kentucky rig is and has been a very common and effective fish catching rig among crappie anglers for years, and if you talk to anglers that target many other species of fish you will find that Kentucky rig has been around for a long time.
How to Clean a Fish (I use a box cutter on cat fish. The blades seem to dull fast and the razors are easy to change. I feel like I get more meat off of the fish. - Never thought about box cutters for cleaning catfish.