mckennie at 22 is way better than marchisio was at 22 for juve. marchisio didn't become a truly good player till under conte at 24-25 years old
but they both went through same problem. marchisio was used as a cm, winger, wide midfielder before finally conte turned him into a box to box cm in a mid 3
mckennie is also being played in all these wierd positions when box to box cm in a mid 3 is his best position.