Strange, isn't it........
I have a Plymouth Rock bantam rooster with exactly the same, but possibly not quite as severe, symptoms.
Mrs Nig even named him Ronaldo after a 'certain' footballer known for diving and faking injury.
He's really unsteady on his feet, can't run to save his life, and is always dropping one wing or the other to the ground in order to stop himself falling over...
...... He still manages to 'see to' his girls though.
He climbs aboard, taking most of his weight on his flapping wings, does his business, then falls off. No biggie.
We had him from a breeder at the summer fair here at the castle... This is his second winter with us, and I hope he'll have many more.... And I hope yours does too.
Good luck.
Nigel.