The biggest consequence if Five never jumps happens to The Umbrella Academy's uniformed time-traveler himself. There are three different iterations of Number Five in The Umbrella Academy - the young character shown in flashbacks played by Aidan Gallagher, the "older man in a child's body" also played by Gallagher, and the adult Five working for The Commission played by Sean Sullivan. If Five was never displaced in time at 13 years of age, he'd be a very different character in The Umbrella Academy's present timeline, where the Hargreeves siblings are all nearing 30-years-old. Just like the others, an adult Five would be very different to his younger self - perhaps finding a career as a frustrated high school science teacher or working in a mannequin factory. Five would probably harbor more bitterness about Reginald too, having spent more time in the abusive Academy. Five would surely follow Allison, Diego, Klaus and Vanya out of the door, rather than sticking around with Luther.
And here’s the showdown we’ve been waiting for: Emily vs. Victoria. Decked out in her classic black hoodie, Emily enters the room with gun at the ready. Victoria’s confident she’ll win for two reasons. First, she expected Emily to pull something like this, so she installed cameras all around the room to capture Emily murdering her. Second, Emily has never had the strength to kill in the past, and she doesn’t believe she will now. Thank god for Emily’s soul: David appears and shoots Victoria to save his daughter one last time. It’s the one move Victoria never saw coming because she’s never had someone who would take the fall for her like this. It brings the story full circle because not only is David saving his daughter from the dark side, but he’s also taking the fall for a crime he actually did commit.