Assuming that Bucky Barnes is simply a normal, super-power-less, human soldier, why would Captain America's enemies, Hydra, waste time converting him into the "Winter Soldier", especially as he is/was severely injured and not a natural supporter of their regime (hence having to brainwash him)?

Would it not have been easier to simply recruit from within their own ranks (those of Hydra) and find somebody much more willing and aligned with their cause?

Bucky does not possess Cap's super power(s) and is brainwashed, so, presumedly, he can't remember anything that might be useful against Shield/America/Captain America?

So why bother with Bucky???