Is a plant not fading an issue?

No fade is not an issue. No such thing as more chlorophyll causing a "bad smoke", you will be fine. Curing your buds properly is what produces a smooth smoke.

I’d listen to mouse or grannie on this.

Completely forgot... I'm just now harvesting a grow that did not fade at all either - but the trichs told me it was time... and it's the same strain as the one I mentioned smelling of grass... I'm sure this one will, too - and I'm not worried about it at all... yours, too, will be fine!

The whole point of the drying process, other than to get rid of the water in the plant, is to break down the chlorophyll.... I just harvested a plant and was absolutely PANICKED when I opened up their drying tent a day after the wet trim and all I could smell was grass.... I was told that smell, while not typical, was the chlorophyll deteriorating and "leaving the building" ... but I thought the whole thing had gone south on me (I almost said "gone to pot" but just couldn't bring myself to use the stupid pun!) ... but after a few days curing, that grass smell went away and was replaced by such a wonderful smell - the terps were really coming into their own.... and it is still that way today. As to why one faded in week 4 of flower and the other did not, I can't tell you.... but I'm wondering if you checked her trichs at that time? Might she have actually gone PAST her prime? I hope not.... They're individuals and maybe she was just ready for harvest earlier than her sister.... I don't know... Good luck... I think you'll have some LOVELY smokes out of her!

High, she might just have matured a bit faster then the others. You can also see that her pistils dried faster then the other plants. I would not worrie about it this plant is almost ready for harvest and every big change would just be unnecessary work and stress. Enjoy your harvest the plants are looking goooood!!! 😋