Bernhard a al suite to GGR 2 had 4 rank stars only
Steve,
Bernhard would have worn the three variations of insignia;
Promoted to "normal" Generaloberst on 15 September 1905 (3 stars as shown in your portrait of him)
Awarded the rank of a Generalfeldmarschall on 11 September 1909 (3 stars and crossed batons)
And the final insignia per AKO of 3 January 1911 (4 stars)
Regards
Glenn