I agree very true. However your description of the Sparrow should read "Jack Sparrow's Blade" a renowned but sadly inexplicably nerfed legendary cutlass"It is to be noted that conjuring a Legendary from the game's random number generator is a challenge, and unfortunately for some, luck may not be on their side. While I do recommend you keep at it for the chance of that glorious red text, I would highly recommend taking breaks as well as to not be dwelling with your computer for too long, as it can be damaging to your health.
(Also, to confirm your statement, General Darkhart is confirmed to drop Jack Sparrow's Blade, a renowned Legendary Cutlass.)
Fair Winds,
Misha