I think this fight will be competitive early on and Brook may even catch Crawford and drop him but as the fight goes on I expect Crawford to come on strong as Brook starts to slow down. Brook has had bad damage to his eyes from previous fights and I think Crawford will be able to target his body and those eyes to break him down.
I expect Crawford to win by knockout in the second half of the fight after a competitive opening due to being fresher and also having the better skill set.