I mean, if the "FC changed the timeline" theory works for you then knock yourself out, but I don't see why FC is any more likely to have changed the timeline than, say, McCoy leaving his phaser in 1930s New York in "The City on the Edge of Forever," or the Klingon bird-of-prey decloaking above whalers and beaming George and Gracie aboard in TVH, or Picard and Company traveling to the 1890s and meeting Mark Twain in "Time's Arrow, Parts I & II," or Quark, Rom, and Nog becoming the Roswell aliens in 1947 in "Little Green Men," or Sisko replacing Gabriel Bell in 2024 in "Past Tense, Parts I & II," or the starship Voyager flying over the 1996 Los Angeles Basin in "Future's End, Parts I & II," or....