Why is جُوْرُ obligatorily diptote here while هِنْدٌ / هِنْدُ permits both treatments?

Cause of Ghayr Munsarif: Feminine Alif and Feminine Proper Names

• جُوْرُ is foreign, which supplies the additional cause.
• هِنْدٌ has feminine alif.
• جُوْرُ is plural.
• هِنْدٌ is masculine.