Eubank Jr had never done 12 rounds before. Never beyond 8 rds twice on points.BJS has done the championship distance before he paced himself correctly won the early rounds first 4 if not 5. BJS has a good chin took some decent shots but his overall quality won the fight....in a fight he did not need to take fair play to him.
Time will tell Eubank jr was the best thing sinced sliced bread before the fight he lost, if anything this will the next Bellew vs Cleverly rivalry of two over rated guys. Eubank's dad was a world champ he will have spent time in the gym from being a kid even if he was not fighting, he has been all over the world training with to pro's. I can't see him ever beating Golovkin and going up a weight he would probably not be too great either. I am not too interested.
Remember how Chris Eubank Sr had more experience at world class before the first fight with Benn and he won and in the rematch when they both had a lot of experience at that level he drew but in reality lost. We will see what happens 3-4 years down the road they both have a long way to go in my opinion.