Rust is not especially infectious and is more a result of stress from dry weather – well it was dry enough here in the hot weather of late May to bring it on here! Some varieties are more susceptible than others and I have more rust on garlic planted early October than on a late October planting.
But is has all grown well and at this time of year I am in no rush to harvest unless plants are really yellow. Yours sounds fine and it should dry and keep as well as normal. I have planted cloves from rusty garlic and had wonderful harvests, and I compost the leaves as well.