Lavender is recessive, so it takes 2 copies for it to show... breeding to buff it will act like black, so results will most likely be blacks with buff leakage...
I was afraid of that. Guess he'll just get to hang with the main flock. Unfortunately he's about 4th or 5th in line, but he's a great tid-bitter for all the chicks running around and a lot of the brooding hens stay close to him.