I agree with CNC, broadleafs don't make near the thatch that geass does. I've done T&M into thick, dead matted down crabgrass and was worried the seed wouldn't make it to the ground, but it did. I pulled back the thatch after making one round and seed was on the soil. The rain will wash seed to the ground, as well. How do ya'll think weeds and grasses spread their seed? They been doing it for millions of years without us disking.