i don't believe these two WTEs can be an established couple, yet. the ringed eagle (who is a male i think) is a 5th winter bird like aita wrote. one can see rather a lot of black in his tail. i don't believe that he is mature yet.
i think that they clearly were of opposite sexes. the unringed eagle had huge lumps in her ankles and it was bigger altogether that the ringed eagle. i think it's fairly certain that the unringed eagle was a female and the ringed was mae. i believe is probably a 3rd winter bird and clearly "a baby" in what comes to breeding. her quite dark eyes are a sing of young age, and so is the dark overall plumage together with a very dark tail. the beak, however, has turned almost light already.
i have also found it very interesting question to me is how the eagles can see each other over large distances. more intriguing is how the apparently also discern the sex of the other eagle.
these two didn't for example talk to each other at all. we would almost certainly know their sexes if we had heard their voices.
the different aspects in the appearance mature in different pace in different individuals. the same applies to actual breeding matureness. i have heard from an ornithologist that the youngest eagle who bred successfully for the first time was 4 years old and the oldest first-timer was 14 years old.
i think their behaviour was not a parent-eaglet behaviour and it was not mature courting behaviour either. however, the girl was clearly very interested in the male. she tried to pull his feathers and tried to get close to him. the male on his part was submissive and reserved when the girl came close to him. in time they may become a couple if they will not loose track of each other. on the other hand they may well already be flying apart and never meet again... who knows.