Have you ever studied sumi-e? Me neither (well alright a little) but my point is that the paper is just as important as the ink in the expression. Both the presence and absence of color can be critical.
But not as critical as the overall expression, and that includes color, placement, retrieve, direction of flight (as in flee), and speed. Everyday can be different - there are no steadfast rules but themes repeat and from that a consistency forms over time and in my opinion, this is the only level worth memorizing.
Stripers are remarkable fish. They inhabit a wide range along the seaboard, traveling that full range rhythmically and methodically with clockwork seasonal precision. They become very focused on behaviors, preferences, and most importantly their impulses.
The key to successful striper fishing is to know their impulses. If color in a fly is part of that equation on a given day, then it is critical. If not, it's insignificant.