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My english is not good enough to explain why the loop doesnt need to be super strong. If the shaft breaks and is kept close to centerline it wont do much damage, if that makes any sence
Your communication skills are fine, but what many seem to overlook is not all DS failures are front u joint, they can be the rear joint, can be the front yoke, can be the DS itself, and can happen at any speed, since higher speeds cause greater runout, increasing chance of DS failure. If the failed DS was pristine and perfectly balanced, containing it inside a small perfect circle would be no big deal, but we are usually talking about a hugely unbalanced twisted 5'? long flexible tube, inside an oval, powered by a 3,000lb car accelerated by a 3-4:1 rear end, for hundreds of revolutions, and the mass is constantly increasing in diameter each revolution, extremely multiplying the forces. Hanging 200lbs on it as a test is like checking your timing with a wet finger. 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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