I like Bud but I don't think he'd be as effective at WW & I believe Jr. Welter is probably his ceiling at his current high level.
Thurman is a huge WW with speed, accuracy, & power. He's a totally different kind of beast that Bud hasn't seen before. Thurman's the naturally larger guy with almost as much skill. To me it's a similar situation with the Gamboa fight where the just as skilled naturally bigger fighter won the fight. Thurman's punches will most definitely hurt Bud.
Idk I think he could beat Thurman right now. Just based on the eye test. Crawford seems a little faster, more composed with more ring IQ and adaptability, have a better defense, seems more accurate... Only things Thurman has over him are punching power and size imo add to that that while he punches stronger, he is less accurate with it so...
I think you are too cautious to put him up with the best ww's but honestly. Crawford is already a big jr ww and there will be no consternation for him once he's facing these guys. They are just the natural next step they are not heads and shoulders above the likes of Postol. They are better but as I said not so significantly to cause Crawford that big of a problems imo... Thinking bout Danny, Thurman and Porter here who I think round the same level atm all of them with different styles which works against different people.
I was higher on Thurman two years ago or so but his mistakes been exposed since. He is still a very good fighter but he lets too easily others to bully him and doesn't react good to getting hit at all. Looks like he starts panicking. So he has some defensive holes and he doesn't react good when he gets hit.
Porter is rugged af and awkward to anyone just based off of his fighting style and sheer physical power but with nicely placed, good counters he could be taken out imo, that's something Thurman failed to do imo... He countered him hard sometimes but not enough times, his luck that many judges tend to give the rounds to a fighter who has the more eye catching shots even if he's getting outworked otherwise.
Danny is a nice fighter but I feel like he would be overrated and his limitations are very visible imo. To put it simple, he can't cut off the rind and doesn't like to box front foot. He is flat footed and his handspeed is also mediocre at best. His defense is solid but nothing spectacular he ca be tagged. His timing and chin are outstanding though and they are pared with good punching power and accuracy to close distance.
The hardest out of these for Crawfod would be Thurman imo but I would pick Crawford with a closer than Postol (8-4 maybe) UD.
at you telling me about being objective. I'm prolly the most objective nikka on here. 
Rigo, Crawford, Bradley, Canelo, Ward, Andrade, Joshua, Walters, Porter, etc... for me there are way too many talents and good fighters to cry over one of them went stray...
