 Complete the following phrase:  Len Dawson was the franchises most successful quarterback, playing in 182 regular season games 158 starts for the TexansChiefs, and holds many franchise records. He was nicknamed Lenny the Cool for his calm composure on the field. Dawson completed 2,115 of 3,696 passes for 28,507 yards with 237 touchdowns and 178 interceptions, good for an 82.6 career rating. He ranks first in team history in pass attempts, completions, passing yards and touchdowns. He led the Chiefs to 94 regular season wins and three AFL titles. Dawson led the Chiefs to an appearance in 