3 defensive lineman, maybe even 2 with an additional 1 in coverage at least, maybe 2 in coverage prevents Kelsey from running free. The situation with 13 seconds was one where you Wanted Mahomes to be comfortable. You want him to take all the time in the world. Pressure isnt possible when its obvious hes releasing the ball within 2 seconds, so dont even think about teying to apply it with 4 down lineman.