Ant-Man is far more valuable in a fight like this than Hawkeye and Black Widow, I'm wondering how both of them will be used maybe there's something more ground based and stealthy they can deal with.. actually that would be their best use, they are both stealthy as fukk they can help out in that regard. They don't really want it with Thanos in a hand to hand situation
I think the best squad to handle Thanos with who is left is obviously Thor, Iron Man, Cap Marvel, Cap and War Machine.
They could have used Doctor Strange the muthafukka was giving Thanos PROBLEMS by himself..