Absolutely. The guy is 21 years old, moving to a new country, in one of the hardest leagues to adapt to in the world, and he has done bloody well so far.
Would we get our money back if we were to sell him in the summer? Probably not.
Would we get our money back if we were to sell him in 2-3 years? I definitely think so, and much more.
To reiterate, he's 21 years old. He's not even close to being in his prime.