I'm believer now.
I just did the soak method on two little front leg tendons. I was kind of amazed at the quality and quantity that came out of them.
The difficult part, on these particular ones, was separating the sleeve. I had to slice it down the center then pull thw tendons out. Also decided that a couple pairs of needle nose pliers comes in real handy till you get rhw tendons broke down in to smaller pieces. From there a plastic backed thumb tack separates the fibers real well in a pinch.
I'll try some larger rear leg elk tendons next.