i think you are going to love kulu though. he played on right and centre for parma fine. and he's a fake leftie. meaning he can use his right foot, but chooses not too, kind of like dybala.
you are going to love his intensity and quick thinking in tight situations.
edit: and if it makes you feel any better. juve's record with buying young players (18-23) and using for first team is mostly successful.
players bought that were young and succeed: pogba, morata, bonucci (first time), dybala, de ligt, bentancur, lemina, coman, demiral
players brought in that failed: Rugani, Sturaro
and if you look at from the perspective of big fees for young players, our track record has been 100% success. dybala, de ligt, bentancur, demiral. have all proven themselves.
hope this helps take your worry off