Willock has a great drive to him. You see it every second he's on the pitch. He almost never coasts. With his size and athleticism, he might be able to cope better than most think next season.
Speaking of which, Emile Smith Rowe seems to have packed on some muscle since the winter, too:

Nelson has talked about getting bigger and stronger since he last played for Arsenal too. The fact that most of our young players are powerful, fast athletes will help them make the step up to Premier League football.