Rumlow, Sitwell and others have been briefed not to give the scepter to anyone including Avengers or even Hydra agents themselves.
To make it more interesting for Cap
Rumlow gets tasers, combat knives, magnetic cuffs, 4 agents in that elevator replaced by Nolan Bane, Slade Wilson (cw), mcu Batroc and Zemo. In disguise. Cap however unaware to these guys
Cap gets his Shield.