So what i meant earlier about a rush job with the black order is that in the books each of them has a unique "niche" that individualizes them.
Ebony Maw is telekinesis/telepathy, Cull is basically a "Hulk", but Corvus Glaive's ability [apart from super soldier physical attributes] was immortality. As long as his scythe thing wasn't destroyed, he survives/regenerates from any injury and even obliteration.
More so than that, Corvus is actually the GOAT of the group [Thanos favorite one] and is every bit as charismatic as Ebony Maw. He invades planets with those creatures we saw in Wakanda, and after he kills all of a planet's greatest warriors, he goes to their leaders and says Thanos will accept your surrender if you give a "tribute". A 'tribute' being the decapitated heads of the oldest child in every home. And of course he's smug about everything.
Proxima Midnight is Corvus Glaive's wife, and is "Wonder Woman" [or perhaps "Valkryie"] physically, with a cosmic lance comparable in power to Thor's hammer. Disperses energy and can basically become a "light saber" lance when thrown.
Basically these 4 together are Avenger's level villains on their own. But obviously Corvus and Proxima had to get dialed back a bit bc not enough time for the personalities, and bc Cap/Widow/Falcon had to have someone to fight.