The Agreement Between Avengers: Endgame Thanos And Ronan:
In Avengers: Endgame, Thanos sends his daughters Gamora And Nebula to Ronan. We first see the Mad Titan’s daughters when Guardians of the Galaxy introduces them to the Marvel Cinematic Universe. During that time, they were on loan to Ronan the Accuser. Furthermore, Ronan is a Kree zealot who wishes to destroy Xander and the Nova Corps.
Ronan And His Relation To Thanos’ Daughters:
In Avengers: Endgame, Thanos clearly strikes some sort of an agreement with Ronan. This involves Gamora And Nebula. However, it never explains why the Mad Titan sends them to Ronan. A line that was written in the screenplay of Endgame could have shed some light on this question. However, the scene did not make it into the theatrical release of the movie.
The Scene Where Avengers: Endgame Thanos Sends His Daughters to Ronan:
After the Avengers go back in time to try and retrieve the stones during the film, the perspective shifts to Thanos. It also shows the times of the past. It is then that we find out that Thanos gets information. He is informed that Ronan discovered the Power Stone’s location on Morag. In Avengers: Endgame, Thanos tells his daughters that they’ll go to Ronan’s ship. Moreover, they will keep an eye on him to make sure his obsession with Xander doesn’t cost Thanos the Infinity Stone.
The cut line from the scene has Thanos saying, “After Loki, I’m taking no chances.” It is a very small thing. Regardless, it shows that Nebula, as well as Gamora’s involvement in the events of Guardians of the Galaxy, are related here. Their involvement is a direct result of Loki’s failure to retrieve the Space Stone. Furthermore, it is due to this involvement that they lost the Mind Stone as well.
And it is this failure which makes Thanos send his daughters to Ronan. Subsequently, it is due to this that Gamora gets the opportunity to act against her father. And by doing so, she becomes entangled with Star-Lord and the other Guardians.