It should be a sequel to Captain America: The First Avenger also. We see Red Skull again after 7 years so this answers the question to "Where did he end up at when he was sent through a portal with the Tesseract. If you disagree, could you explain why?
Technically, Infinity War is a "sequel" for all previous MCU films since the movie was described by Marvel as a "culmination of 18 films". However, we only list the latest sequels (Captain America 3, Guardians 2, Thor 3...). It's enough.
I swear to gosh it was confirmed, but until I find the exact source I will not revise it back. However, please do message me before deleting my work so I can copy and paste it onto an online file. Also, is there still a way to access what I wrote about Steve Rogers' time in Fogwell's Gym to bring to an online file or no?
I don't understand why there is a very unclear and masked image of Zemo for his profile photo, and when I tried to change it to a MUCH more clear and unmasked photograph of him, you blocked me for some time and reverted the edits.
Hey, I'm not an admin here, but most of the images on those pages are meant to show the most recent appearance of the character. Although you're right in that there are more clear photos, the one with the mask is the most recent official one and a better one will likely be added once we get more images of him from the Falcon and the Winter Solder show.