I don't mind you popping into the conversation at all, in fact I greatly appreciate it.
The film critic I mentioned earlier is Gregory Ellwood.
https://twitter.com/TheGregoryE I don't know how much inside information he had but he was one of the few people who was not surprised to hear that Angelina is not playing Sersi and is in a supporting role instead. He's the one who seemed to suggest that Brian Tyree Henry is playing the gay character, if I was interpreting his hints correctly. Again I'm basing that mostly on a smiley face emoji, lol.
Thank you very much for linking that extended clip, I had not seen that before and it suggests two things to me:
1.) If the gay character is Ikaris then I doubt his family gets fridged like in the comics if Feige is referring to the character's family as being "a very sweet part of his story".
2.) Feige saying the gay character's storyline is "an important part of the movie", highly suggests that the character isn't a minor character that's only in a couple scenes which sounds more like it'll be Ikaris than Phastos.
I also noticed someone on twitter pointing out that it's a bit suspicious that Richard Madden hasn't been talking much about his character in interviews.