CJ,
If you take a really good look at a quill gordon, a live one and not a traditional catskill tie which is tied with a greyish quill from the peacock eye sometimes, you will see the real insect shades more to the olive side. At least I tend to see an olivy color. A lot of the traditional flies from that area dont truly represent the insects color. Take the upcoming grey fox for example. The traditional catskill fly is tied with a grey body when the insects body is more of a creamy tanish color. The Dark Hendrickson tied with a greyish body too. If you look at the old umpqua catalogs...you sometimes wonder where some of the colors came from.
Something else to keep in mind...it was coming from a
NJ stream, could have flown down from the meadowlands which may explain the gray all over. sounds like a tarnished tin man.
Check the PH in the river next time with a simple strip. QG need very good quality water.
I still think it was an adams hatch though...