If you don't know the WLL of the winch or whether it even has one, then you can't compare the WLL limit of any rigging with any degree of effectiveness whatsoever. That and you can't mix and match industries. The WLL limit minimum for overhead lifting is 1/5th of breaking. That means the typical 3/4" alloy bow shackle with a 7/8" pin with a 4.75 ton WLL breaks at over 45,000 lbs. and that's just stupid overkill. Add to that a few other things and your winch in a straight line pull can't even break a quality alloy 7/16" bow shackle.Don't know, winch manufacturers don't rate them by WLL, but should be generally safe to assume that a winch and mounting, if done per industry convention, would be solid up to its rated line pull. Everything else is easy though...i'd prefer my winch motor to stall before I exceed the capabilities of anything that can fly.
If you apply WLL constraints to most 9500 lbs. rated winches, then the most you should pull is 1900 lbs. to stay within those standards. The other part of that is there is only a very narrow set of conditions whereby you can achieve the rated poundage in pulling power your winch is rated at. It has to be on the first drum layer, it has to be past the 5 wrap minimum they want on the drum, and all the slack has to be fully out of the line. Statistically, you'll never do that which also means you will almost never be able to use your winch at the capacity you paid for.
Look around, you do realize you are the only dog gnawing on this bone, right?Back on the kinetic rope though, I'm not suggesting anybody bring a slide rule to a recovery and do a bunch of math. I'm just saying that the industry could make it easier to compare and select the right rope as well as know a little about how to use it and what to expect, which right now they can only learn by watching YouTube or just finding out in what may be a dangerous situation.