Non EU teams don't have u21, it goes from u20 to senior team immediately. So basically think of him as being at least around the level of Phil Jones. Also to think of it this way, David Luiz is supposed to be one of the most promising young defenders in his early 20's. I know he lacks discipline but you can see he has the physical and technical ability to make it as a CB, all he needs is good coaching/mentoring to become a good defender. He only had 2 u20 caps for Brazil. Uvini has 13 right now, he might become a better prospect than Luiz. Funny enough Leigh mills who was at the time touted to become better than Rodrigo Defendi has actually retired from football know, and he was england u16 captain.