We know that Zane was one of Shay's friends, along with her, who didn't originally go to the Smoke. But we learn in the first manga that Zane was freaked out, because he learned Special Circumstances was real. Do you think, if Zane was never interrogated by Specials, that they both would have gone to the Smoke first, and not on the second try for Shay (even though David didn't originally want her to)?
Although Tally was quite tricky, even sneaking into a Pretty party, she always wanted, like most, to become pretty. We know from the Pretties novel that all Specials were tricky enough to stop being "bubble-headed". So do you think she would have still become a Special, being really tricky, even if she had never met Shay?
We know from the manga that David first didn't want Shay going to the Smoke just because she had started loving him, and that once she did go to the Smoke, she and David started having a relationship. But then David and Tally started loving each other. If Tally hadn't (accidentally) told the Specials where the Smoke was (and caused David's dad to die), how do you think Shay and Tally's relationship would have been, along with David and Shay's relationship? Do you think Shay would now just be David's friend? Do you think Tally and Shay would still have become "frenemies" because of deciding who "owns" David, or would they would have worked it out? In the other "What if..." topic post, someone said Tally might have been murdered by Shay...