Radahn was always going to be the consort because even if they chose Godwyn, it wouldn't be as unique of a boss design (he's almost always imagined as an adult Miquella). FromSoft also probably saw the fanbase liking Radahn so much that they had to bring him back.
It's still an equally stupid asspull considering Miquella already ascends to godhood and still needs a big bro to help carry him in the fight.