You're right. I don't comprehend how you think that Tweedy won an entire major because of the character he was playing, or how that Starfire is some character that is an instant free win because "lol chip damage projectiles" even though her and Fate were the only two pure zoners played in top 8 from memory.
The only thing that you explained was why Bio lost to Tweedy, which basically came down to "Bio was under stress", which is probably true but there are dozens of other factors that come into play, and that "If he picked SF at 0-1 he would've won" which just isn't true, because you don't actually know, not for 100% certain.
Starfire is 100% not a free win, there's gaps in her block strings, her zoning is certainly possible to get past, there's answers to her footsie buttons, and her chip damage is almost never guaranteed. Everytime you see a SF go for Stardust on block it's a gimmicky, there's a gap there that can be full combo punished easily.
People who think that zoning is just a free win in IJ2 anymore are just flat out wrong, sorry. Deadshot got nerfed 6 months ago and he was the only one who has ever been a problem for the game. MB roll exists, and there are a plethora of counter zoning characters and bad MU's for zoners that people seem to disregard. Black Manta and Atom would be my first 2 picks. I'd also say that Hellboy, Cheetah, Beetle, Brainiac, and Supergirl would all be good picks, maybe not 6-4, but 5-5's at least.
But sure, keep thinking that Starfire is just a ridiculous character with 0 explanation as to why. I wouldn't be surprised if she got nerfed, but she isn't pre-patch Deadshot, and has clearly defined bad MU's and issues.