Err, what?
Priest's Captain America and Falcon came out after his Black Panther was cancelled. I think there may have been a Falcon solo planned that was dumped, but it wasn't for Black Panther.
And I'm fairly certain that the end of Power man and Iron Fist was never meant to lead into a Cage ongoing.
Priest was just salty about the series being cancelled, and so ended it with Luke on the run
Also, Blade is pretty damn old and still spends plenty of time in limbo. How certain we are he's an absent parent?