It’s hard to say one way or the other, but the writers clearly weren’t planning to have Talos be a major player.
The Skrulls are usually portrayed as evil in the comics, so Captain Marvel subverted fan expectations by making them helpless refugees that team up with the hero.
Marvel fans can re-watch Ben Mendelsohn’s time in the MCU on Disney+.
Perhaps the original draft of the script was going to make him evil and kill him off, but decided to take it in another direction?