How good would you say he is? I think he's a great talent. He can box, but he can also fight on the inside (look at his fight with Burns). In the Gamboa fight, he showed he could adapt. He's also a switch-hitter, and is equally good in either stance. I see him cleaning out Lightweight, and being a handful for a lot of fighters at 140.
He seems to have a bit more dog in him too, ciompared to Broner and some other up and comers. Not just talented, but seems to have some steel behind him too.
Defense is and has always been a problem. I have been saying that since before he fought Prescott, which is quite a bit longer than most fans have even known he existed. He was matched soft for too long - often looking bored with his opposition and sometimes rumbling with them and eating a few shots just to showboat - and developed some pretty lousy habits that he is yet to fully shake. (and may never) Luckily for Crawford he is quick, agile, tall, and has a great chin - so he is yet to pay for his defensive flaws...but don't be surprised if/when he does pay, big time.
135 yes I don't think he can beat Danny Garcia, Mathessey, nor Algeir at this time, May a few years from now.
I'll be following his career closely now. He came to my attention fighting Burns (I'm from the uk), and he was very clever in the gamboa bout. I'm interested to see how he deals with taller/bigger guys as he's a massive lightweight and will surely step up any fight now.
His biggest problem for his future career isn't his boxing ability, it's his personality. He doesn't speak.