Wow, hadn't been aware of EDS, but a quick googling reveals there are various types of it, and I have the same hypermobile left elbow as this kid, plus other related symptoms. I imagine that hypermobility in just one elbow, not other joints, might not impress an EDS diagnostician so much though.
From Google
What are the specific symptoms of Ehlers-Danlos syndrome?
People with hEDS may have:
joint hypermobility.
loose, unstable joints that dislocate easily.
joint pain and clicking joints.
extreme tiredness (fatigue)
skin that bruises easily.
digestive problems, such as heartburn and constipation.
dizziness and an increased heart rate after standing up.