I do believe it may be the case, the Weimaraner has some variations of the mousey brown/tan color or gray brown, Levi looks more grayish in shaded areas, hence the Gray Ghost moniker, there is a lighter gray, a long haired throwback which used to be destroyed as were the blue gray variation which can be nearly charcoal, all are now recognized. There are 2 Siler Labs in town, the fist time I saw the first one I took it for a Weimaraner with an undocked tail, but the second time the eyes were definitely Labrador Retriever eyes and the tail far thicker although it had more of a blocky head than the large head you would expect. Don't know enough about Labs to say if this was also a throwback gene or not but they are quite handsome
banjo