"He does not need to be as good as Steve to hurt Cage with the shield. His bionic arm even puts more force behind the shield than Steve could have done. "
Bucky is weak and no where near Cage's league"
No where near Cage's league in what..strength? That doesn't matter.With the arm Tony gave him and Cap's shield combined with him being a better fighter than Cage by a huge margin.I see no reason why Cage would beat Bucky.