Have there been instances where exceptionally tall athletes have formed relationships with partners who are notably shorter than them, showcasing the diversity of connections in the world of relationships?

Of course it is. This is not uncommon in the world of sports and showbiz. Men with tall stature most often prefer petite girls. If you're really interested in this topic, check out this article https://www.talkbasket.net/122533-very-tall-athletes-who-chose-tiny-women-as-their-wives. There is just a list of athletes who have chosen for themselves girls shorter than themselves.