MARVEL Cinematic Universe Theories

I heard today the screenplay is completed for GOTGVol2 I so hope the soundtrack is just as good

We haven't learned much of Thanos's species in the MCU. Star Lord's dad is an unknown species. Star Lord's father could be...... THANOS

I have a theory on Civil War. Possible spoilers.
What if instead of Cap dying, the big death towards the end of the movie is Iron Man. One way he could die is Spider-Man is at a press conference about to reveal his identity when suddenly he grabs a gun and shoots Tony and it's revealed that he is being controlled by Scarlet Witch. That second part is unlikely but it would be interesting.