I think it is good that players like Reiss Nelson, Ojo and Jadon Sancho are all getting game time in Europe. They have great ability, speed, dribbling qualities, but what players like Walcott etc. have had in the past is the technical ability to put in a good final ball, or be able to finish. Giving them exposure to leagues where technical ability is a bit more important as build up player is a bit slower and more deliberate will aid them in their development
