WARNING: The following contains spoilers for the Season 1 finale of Loki, "For All Time. Always.," streaming now on Disney+.
The Loki TV series promised big changes, and while it wasn't super shocking, given the Doctor Strange sequel already revealed the Marvel Cinematic Universe was going to explore the Multiverse, it still definitely packed a punch and shifted the status quo. But apart from messing with the Sacred Timeline, the finale also accomplishes a major achievement by making the Asgardian trickster the MCU's most important hero.
Certainly, arguments could be made for the now-deceased Iron Man, who snapped away Thanos, or Hulk, who snapped people back to life, and even Captain America for leading the time heist. Some even think the Sorcerer Supreme is going to be the deus ex machina to patch everything back together. But the reason why Loki's the main guy to watch is because he's there at the fracture point and understands what's truly going on.
The former God of Mischief is front and center, listening to He Who Remains (aka the good Kang Variant) talk about why time needs to be doctored and worlds pruned to maintain order. Loki starts understanding some bad needs to occur with the good, ergo why anomalies like Sylvie have to suffer. While he doesn't fully endorse it, Loki sees things from both perspectives and that's key in his journey.
It's why he was viewed as a successor to take over the Time Variance Authority and why he also tries to stop Sylvie from ending Kang as he doesn't want reality unraveling. The fact he's at the genesis also hints he'll also be there at the endpoint, whether it's to oversee the timeline again or find another solution that works for everyone.
This makes Loki's redemption more meaningful and emotive and allows him to connect with a bit of the dark in the Kangs, as well as the light he wants to live in. It's the price he has to pay, just like He Who Remains, who got weary and burdened from responsibility and, well, glorious purpose. Loki at the finality also evokes Thor in the comics being the All-Father at the end of time in Jason Aaron's run. It even ties perfectly into Mobius' notion that Loki could be the greatest savior ever, with a possible path being a version of Immortus-Kang himself -- one that's less jokester and more serious. He's already the God of Outcasts, so being a Time-Keeper in isolation matches a potential future.
Not to mention, it'd be an intriguing notion for the Avengers' first big villain to be the one to save everyone and everything down the line. Thus, with Loki now at the TVA as the only person who knows the truth, Strange and Wanda Maximoff need to follow his lead.
Loki is the free mind that has learned the truth straight from the horse's mouth, and when all the Kangs come, they want to silence this essential cog in the MCU machine before he does what the original Kang did and restores order.
Season 1 of Loki is currently available on Disney+.