Gunn getting fired had a giant pushback from actors and MCUfags and people didn't like that it was Cernovich who pushed for him to get fired nor the fact that Alan Horn did it so abruptly. And with Gunn getting hired for SKWAD 2 it made Disney reconsider going forward with vol. 3 without him. Plus Hollywoodfags are also very protective of their own to a disgusting degree.
Jeph Loeb is at the bottom of the totem pole and he was only at the top with Marvel when Ike was calling the shots. Feige hates Ike and Loeb was one of Ike's biggest bootlickers and so you get an idea of what Feige thought of Loeb. I mean the last show Loeb worked on being Hellstrom doesn't even have the Marvel logo.
Supposedly he wasn't that good to work with either to the point he and his bud Jesse Alexander (the exec who Sam's dad is named after) were fired from Heroes. Also there's a rumor with him yelling at te Stranger Things Kids because they went behind doors at Comic-Con to try and meet the Defenders cast (Don't know how true that one is).
That said this latest controversy will only serve to give Feige a good excuse to not give him any sort of credit or money and if he uses Sam he'll be doing just that. If he doesn't want people to bitch about him using a white Nova over a Latino one he'll just make Rich into a Latino or introduce another Marvel character as a Latino. But I'm pretty sure Sam's chances of being in the MCU are pretty dead.
In a way that sucks because Sam is a decent character now but it's also funny considering Loeb used Rich's then death to push Sam and Marvel did everything to bury Rich and pretend he didn't exist.