Included in the first part of the shodan shinken shobu no kata grading, under the katame waza category, is shime waza (strangulation techniques). Included in the shime waza defences from a high punch (tsuki jodan) attack is hadake jime (naked strangle), okuri eri jime (sliding lapel strangle), kata hajime (single wing strangle), and washi jime (eagle claw strangle). These defences in this grading speak to the development of the grading system by Shihan Jan de Jong.
The first three techniques are judo techniques. The judo classification includes a shime waza class of techniques which includes many more techniques in addition to the first three listed above. Why did JDJ only include these three from the judo techniques? The answer to that question is that all of the other judo shime waza are applied by tori while positioned in front of uke. This has obvious risks when considered in a self-defence/fighting context (even though some earlish close combat manuals included some of those techniques in their teachings).
Judo teaches these techniques with tori already positioned behind uke. JDJ's grading has them applied when tori is initially positioned in front of uke, and therefore they have to make their way around to the back of uke in order to apply these techniques. You will be hard pressed to find any instruction - jujutsu, judo, close combat - where these techniques are applied against an attack where tori and uke are initially facing each other. Wally Jay in one of his books on Small Circle jujutsu includes a defences where tori simply turns uke around thus presenting their back to tori.
This, I would suggest, is an example of JDJ's adopt-and-adapt approach to developing his jujutsu grading system. While the shime waza are common, the transition from front to back by tori from a punch is a unique adaptation that JDJ would appear to have developed and introduced into his jujutsu grading system.
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