First off, let me just say (and Mods, I know this is not totally kosher) but, pics would be a real big help. I have had brisket that once done has a smoke ring that was a little on the gray side, but, I could see the distinct pink ring at the edge of the ring. I am not sure why this occurs, but, it does not mean it is a bad brisket.
I seems like you rested it long enough to make sure the meat was properly rested, however, did you wrap it in foil and place it in a pre-heated cooler or other container? I find that resting in a pre-heated cooler makes for a better end product.
If it tasted good and was tender, sounds like you got it down. Smoke another one soon and see how it comes out. And then some more.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"I'm Armenian...perhaps...but then again...maybe not..."