This is a golden period for dynamic English midfield players between the ages of 20 and 25. Jack Grealish, James Maddison, Mason Mount and Dele Alli should all be around the top of the game for the next decade.
But if I was Jurgen Klopp, Pep Guardiola or Ole Gunnar Solskjaer and had a choice of signing only one of them, it'd be Jack for me.
All the players I've mentioned have great quality. But Grealish has the edge because of his positional range and the fact his particular gifts are extremely rare.