The Russo brothers have been thinking about all sorts of details in "Avengers 4". From the inner logic of the MCU films, they realized why Black Panther had to return as the first loss from "Infinity War" ...
Attention, this text contains spoilers for "Avengers: Endgame"!
Not Falcon, not Spider-Man, not Star-Lord... for Joe and Anthony Russo it was not a matter of chance which superhero in "Avengers 4: Endgame" after the second snippet was the first out of the portal behind Captain America (Chris Evans) should occur. The choice fell deliberately on Black Panther (Chadwick Boseman) according to Comic Book - and although it was in their reflections actually to Sam Wilson / Falcon (Anthony Mackie).
In a Reddit AMA Joe Russo recapitulates:
"We spent a lot of time in the editing room when it came to arranging the portal sequences. We have not definitively set this part of the movie until one month before the release. "
We always wanted Sam to be the first to communicate with Captain America about this connection, and Sam was last in Wakanda. So it was logical that the portal in Wakanda would open first. And, of course, the king is, of course, the person who first leaves the Wakanda portal - again with his army in tow to save Captain America and the world. "
THE MCU LOGIC IN "AVENGERS 4"
So it seems, the Russo brothers have really worked long and hard on "Avengers 4" and the details of the film out of the existing inner MCU logic. Especially with regard to the finals and how exactly the losses from "Infinity War" can be brought back appealingly for the big final battle.
How well they succeeded, can be admired since April 26, 2019, in Indian cinemas - and soon in the home cinema: From 23 August is "Avengers 4" available for download and from 5 September then on DVD and Blu-ray.