I think he would be better.

Yoel doesn't give Zab too much tangible advice between rounds, it mainly consists of "Let ya hands go!! He gon' run" or words to that effect. It's noteworthy that he's never trained another world champion. Well, save for Mayorga who he recently trained, but Mayorga had already won that title.

Zab's got plenty of natural talent, he can punch, he has good speed, heart, he can put shots together, he can pot-shot when he wants. What he lacks is focus, concentration, fitness (after 6 rounds he becomes notably less effective) and some ring smarts. Against Pineda a couple of years ago, an experienced veteran who knew all the tricks, Zab looked like a damn idiot clowning and showboating, while the fight seemed very close throughout. Think Zab took an SD. Had he not been the name fighter I would say he would have lost. And I'm a Judah fan.

Steward would be good for him. Or Goosen. Guys who strictly focus on certain areas, while keeping and honing their current skills.