3 World Champions at 147 are undefeated. Thurman (28-0, 22 KOs), Spence (24-0, 21 KOs), and Crawford (30-0, 24 KOs). All of them have perfect records.
Thurman just doesn't fight enough to hold all the belts, so he certainly won't. Crawford seems to be one to try, like he did at 140, but I don't think he's good enough at 147. Spence seems to be willing and able. I think it largely depends if he gets all the other beltholders in the ring with him, which basically is the hardest part of unifying a division. You can be the best and willing to fight the best, but others usually won't be that eager.
