Ok I thought The great Protector was a character from Shang Chi comics. Makes sense I never heard of him before. They did a drastic redesign if him too then but I kind get that. FFFs is kinda a generic looking dragon. And with Abomination in this film you probably don't want two monsters with a couple things in common from a visual stand point.
I get that they feel this movie is a gamble and much like Spoiling that Spidey was in Civil war. They wanna make sure the film has as much hype as possible. But Abomination isn't gonna excite the regulars. It's just the die hards who are gonna get excited about his return. So why Spoil that in the Trailer. Even if he plays a very unimportant part. That feels like something that should have been a surprise. And unlike Spiderman in Civil war I don't think it's gonna drive ticket sales much revealing Abominatiin is back. Possible fighting Wong? Or just another wizard. Rumors forever were that Baron Mordo shows up in this film. Given we see maybe Wong(More likely another sorcerer) I can see that being more likely. Though if he was in it, I feel like this trailer woulda spoiled it for us.