Gjallahorn thought they escaped from their crimes and made themselves in heroes. Sadly, it only painted a huge target on their back. That their actions had caused mass chaos in their wake as their crimes lead to their horrible downfall alongside order in Earth, the Outer Sphere, and Mars.
It all started when a group of investigators and news reporters silently dubbed 'The Question' started to record the events in the final battle in which Gjallahorn managed to end Tekkadan for their 'crimes' against them, including the use of the illegal weapon called Dáinsleif. However, when they discover serious coverups that Gjallahorn had made in their ruthless attempts to maintain their power and are willing to do any means necessary to maintain the status quo, they chose to secretly rebel against them and to reveal the whole truth to the world itself.
The Question, who despite being in limited numbers, decided to use methods that Gjallahorn cannot escape from. They secretly uploaded files from their databases and by word of mouth thanks in use of inflitrators and soldiers that are bribed to fulfill their tasks and gradually expose them on the media once they found ways to prevent Gjallahorn from deleting the information without compromising their identity. But the biggest one was tricking the leaders of Gjallahorn(and by extension the remains of the Seven Stars) admit of their wrongdoings live on camera.
With their corruption expose, Gjallahorn mounted desperate attacks on The Question to silence them, but it only created more tensions between them and the public as The Question actually donates money to charities and used aliases to keep themselves covered. The final straw that broke the camel's back was during a celebration event, a group of Gjallahorn soldiers using Graze-Frame Suits and other weapons to strike on major city blocks that were rumored to house The Question operatives. When the tried to cover it up, there was a major public outroar and the balance they once desired was now finally shattered.
Lawlessness started tp reign as Gjallahorn tried to restore peace, but as chaos and violence continues they weren't able to keep it longer than they hope. But once the leaders were hunted down and made 'examples' of their treachery, Gjallahorn decided that they won't have order anymore and most decided to join in the violence and brutaility in the process. That is made worse by various pirates and other unsavory groups as they used the chaos to commit various unethincal crimes against Gjallahorn, citizens, anyone that gets in their way. Order has finally been destroyed; it's everyone for themselves now.
A century passed by and by then Gjallahorn was now nothing more than a mere remnant of its former self. Chaos still reign supreme but some sembalance of order has been made by villages wanting to live in peace but must contend with various adversaries that want to destroy it. But when a group of villages decided they needed to build up their defenses to protect themselves and future allies, they formed a new task group to fight various threats and to maintain order in the lawless era they're in.
Despite the new task group rising up to be the sentinels for their villages, they did not chose to name themselves Gjallahorn; that named caused the downfall of their civilization. Instead, they chose the name that Gjallahorn thought they can destroy, the name that will redeem the founders and the name as they give Gjallahorn the last laugh they deserved after all the hardships they endured.
Tekkadan has finally returned. And alongside a new breed of Gundam based on the elements and nature, they will be the new sentinels to fight this chaotic era for their villages against the threats that want to do them harm. And for Tekkadan themselves, welcome back.