Disappointing German fighter aircraft types

[Knusel]

Dear fellows,

these German fighter aircraft apparently failed to produce but a single ace (listed in order of production numbers):

1. Pfalz D.XII
2. Fokker E.V/D.VIII
3. Fokker D.V
4. Siemens D.I
5. Fokker D.II
6. Roland D.VIa/D.VIb
7. Roland D.III
8. Halberstadt D.V
9. Pfalz D.VIII
10. Siemens D.IV

Any objections against this hypothesis are most welcome

Michael