I think the idea was to keep the spectra line intact, not stitch or even knot it as that reduces the strength markedly, as sailors of old will know.
I'm just wondering how much of the load is borne by the casing (attached) and the core (not repaired).
And therefore, how this would compare to say a fisherman's knot.
Any suggestions? Captain?
(Oh, and without the extension pigtail/loop, you could just take up the slack in the other lines and fly with slightly shorter lines

)