I didn't say 1 would beat Bucky. I said he'd probably have trouble with 3.
And being a Super Soldier doesn't necessarily make you a skilled fighter. Stats aren't everything. Take Civil War for example. Spider-Man has far better Stats than Steve Rogers...but Steve is a much more skilled fighter than Peter. Iron Man is vastly more powerful than Steve and Bucky...but the combination of the two of them overwhelms him because they're skilled fighters that work well together.
John Walker, without the Super Soldier Serum, is supposed to be the creme de la creme of the America Military... yet he got taken to school by a Dora Milaje. Like completely humiliated.
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That's a bad comparison...since an elephant and a human aren't of comparable sizes. Super Soldiers are strong...but they are still human sized opponents. There's no reason why a judo move wouldn't be just as effective against a super soldier as it is on anyone else.