How is Crawford able to move up from 135 and stop guys like Porter and Brook?

[BLASTER1]

His natural weight is 154 and he walks around 180. He is official weight bully. Poor 135 and 140 lbs fighters... he even bullied 147 lbs Porter.

And, he is looking skinny but he isn't. He has big torso and very long limbs. He looks like Slender Man. Like I said, his perfect weight is actually 154. Just like Kell Brook.

Bro you dont know ****.
he started winning titles at 130.
If anyone a weight bully its Spence.
Answer to ops question its his punch placement, speed and knowing how to punch properly.
you can tell he has snap on his punches.

[BodyBagz]

Pac and Floyd’s KO ratio decreased when they moved up but Crawford has increased. Dude has brutally stopped 12 of his last 13 opponents. He looks like a skinny guy from the hood, where does the power come from?

By catching guys at their worse ?