Hard to judge really. Styles make fights. Crawford was still figuring out Kava when he got dropped. Lingered too long on the inside and got clipped. I think he does better with Pac's style. I see Crawford using his right hook counter on Pac coming in and out while walking Pac down.
Facts! Pac has big stamina issues in the second half of fights. Spence and Crawford have excellent stamina and seem to get stronger as the fight goes on. Spence definitely will seek and destroy Pac if he gassing for air in the second half of the fight with big body shots. Especially because Pac doesn't clench, which will allow Spence to keep firing shots.
So what? Crawford got hit, hesitated, held on then was flung to the ground. Not from the result of a punch. When did the rules change?