Gustavo Hamer is more of a holding midfielder. Bel Hassani, Clement, Bruns etc are all attacking midfielders. At 21/22, Hamer needed to play week in week out. Otherwise he'd be lagging behind like Jari Schuurman who waited too long at Jong Feyenoord. Feyenoord probably see more in Wout Berger with his 1m 90 than they ever did in Hamer IMO.