Any chance of Red Hulk and/or the Thunderbolts in the future?
I can't help but think that they keep putting Thunderbolt Ross in these movies for a bigger purpose, whether it be to bring the Thunderbolts together or to eventually transform into Red Hulk.
He was a pretty major role in The Incredible Hulk, but went dark until his small parts in Civil War and Infinity War and now Black Widow which is supposed to take place between those other two films. Maybe he's just there trying to track down Black Widow, but with how well Marvel Studios built to Endgame I believe they're trying to make his character more prominent so he can fill an even bigger role later.
If it's a connection with the Thunderbolts, maybe he's there looking for Taskmaster because of all the skills he possesses.